Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac6b51a8ddf9bdc…

MALICIOUS

PDF

77.6 KB Created: 2021-05-01 05:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 82bc9f4968266290a71436126443d395 SHA-1: 5b635f1cfcd73a62b02e96426e4c18e7d736ed56 SHA-256: 1ac6b51a8ddf9bdc3f135dcabd9825891f6c0a89bd255a7f3244ed64270ebe4f
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/strik?utm_term=is+oil+filled+heaters+safe+for+baby PDF link annotation
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/zurifite_roxipuk.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/dikigarovuxiw.pdfIn PDF document text
    • https://cdn.sqhk.co/japanakoga/dUn9QOm/46892737978.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/eQicpgg/power_warriors_final_fighter_x_reader.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/25410629157.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/32jicXC/stickman_fight_online_download.pdfIn PDF document text
    • https://fixojifuxupelo.weebly.com/uploads/1/3/0/8/130814076/729a93f2.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/hajjiib/dawowus.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/qshiijS/super_pixel_go_jungle_adventure_sims_4.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/Ojbgjgc/animated_stories_from_the_book_of_mormon.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/UjbidQy/kogixaseva.pdfIn PDF document text
    • https://vezikiga.weebly.com/uploads/1/3/0/7/130739663/waxawuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_e8ddd746a24c44a2bc2ced4c658a26a3.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_ac99904831464af8ad19f14c2827ca25.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_6eefcb0810e941efa89feae5610cc3e6.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_0298c52cdba546edbdfec3ed54095144.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_c624e81468544df6ad913934d59044ea.pdf?index=trueIn 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_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 5172 bytes
SHA-256: 2de5ecf472461ef8be7646af0b2eefa2ac408ac023fd4a7c7d693bb9a2e3e966
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10996 bytes
SHA-256: 4ead28a0c5401df3eac9436d2d361f0ee33ffd4d1ddd819fe4319f35835fee9d

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