Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e63d42a346e0402…

MALICIOUS

PDF

78.3 KB Created: 2021-05-29 07:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cff3b9886970a2802f136dcd52b66ea1 SHA-1: 76da990141d32acb0abcb6345b57d80aa4a9b36a SHA-256: 2e63d42a346e04021afde64adc73f5bee809f6b2c84b39f1145ab46dcda59707
352 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'Wifi password recovery' and a creation date, suggesting a lure. Crucially, it employs lures for 'Recovery secret / private key request' and 'Password-protected archive handoff', indicating an attempt to trick the user into providing sensitive information or downloading a concealed payload. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=wifi+password+recovery+pro+free+download In PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/9074251.pdfIn PDF document text
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/287026.pdfIn PDF document text
    • https://jufapodoge.weebly.com/uploads/1/3/4/5/134582619/bezavikeverajem.pdfIn PDF document text
    • https://jerezuwiwufuken.weebly.com/uploads/1/3/4/3/134355676/6198355.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/fibuximesag.pdfIn PDF document text
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/2195676.pdfIn PDF document text
    • https://paparudedolenod.weebly.com/uploads/1/3/4/6/134686514/kusetep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/177e6403-9815-43b8-9e13-acfeaa6f0947/13035518557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7aacf5-b744-4246-84f3-cc2a307567c9/the_untethered_soul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34c966c-a25c-43af-b4e5-eb728939e60e/96773022617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cae7bc8-ccb3-4ce4-8649-1b491dc810ca/boy_pic_for_whatsapp_dp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe989fd-2be8-498f-bd7d-d5521f13b7c2/concepto_y_funcion_del_sistema_endocrino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68be3eeb-ec5b-42bf-8cbe-6d95dd3f85c2/fuzewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39205111-7256-48b1-90a6-852246692ec1/fd130_duo_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926eaeda-274e-4e78-bacd-34c5d993de16/jidutanifebiwiwuvimefuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d970ca-f501-43b1-a565-360eeedb6913/gezebad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba51e5ca-598b-4d02-a08e-b0d73f3d62c9/20944250568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8935751a-07f9-42bf-90ef-a98b81691436/5_love_languages_test_teenager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7fb723-d4f0-4124-8264-1442518cb562/2834282265.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 5416 bytes
SHA-256: a2775d17621b8b0077b5953f1672a0c1318d15c7bddc03729479ff7aafcb9910
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 11604 bytes
SHA-256: 38a29ecf69abf72d435f00a3c637c24737a195cf2c68a8701231b8b134ea6451

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