Malicious PDF — malware analysis report

Static analysis result for SHA-256 5277d501160d3f28…

MALICIOUS

PDF

78.9 KB Created: 2021-03-05 10:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 07f7b68a14447301289486747ef8209c SHA-1: 01eb53ed2d0028cbd8ae2a0b1bd4a4371b48e599 SHA-256: 5277d501160d3f287ed9467655ffac5a74181ec8c07f2f6db6f95f98d75882b7
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, contains fragments that suggest a lure, and the presence of numerous links points towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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/aws?utm_term=will+appreciate+your+feedback In PDF document text
    • http://interbank.link/20298897854n1573.pdfIn PDF document text
    • http://4kuhd.me/classical_guitar_musiciansns7ri.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/33482840379.pdfIn PDF document text
    • https://cdn.sqhk.co/livulopo/giAicha/ghost_rider_3d_apk_mod.pdfIn PDF document text
    • http://erogan-encolumbia.site/lunekaxinekivevozue8x33.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/rock-ola_jukebox_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/Fszhfih/pibetel.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/etjihcf/6692370477.pdfIn PDF document text
    • http://wajofima.mywebcommunity.org/zafejutoz.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/hU0adia/lejexiwufibetijojem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_14d265c3219d46c8b95b6ec57f39f5bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3579b1fe-3cb3-43aa-aa9c-2601076e69b9/are_sony_blu_ray_players_region_free.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_ec31b369e53241df96a2eaa04a13d429.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_a6650d4d95f64fc1a1dc853779151f68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/what_is_a_qa_specialist.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_8e355022bab143e8936d090e8d68c745.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_9e2f0b6ee1144b3bb6ff8cbbc7d1f4dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b41449-d4bb-4db8-84aa-eafed0e730e2/donufojut.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/nuxatawuwogumisuregano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32b412e-3bb9-40db-863e-df786c32a5d4/hp_deskjet_ink_advantage_2545_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31a7d62-7cae-4171-956a-68c167024425/xitaxik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 5292 bytes
SHA-256: ce24f2f072a9237347d5dc549e61895ec1cade9aa29cccb7343a19d85b34f33a
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 11324 bytes
SHA-256: 6f8720095fd4c164cd055da218bbac93e53b516f0bfb7f2f8c5847bc08703c4e

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