Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f8bf5a35686f72…

MALICIOUS

PDF

70.5 KB Created: 2021-03-31 19:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7bf22e2488b3e94e374e88d912b1cb01 SHA-1: 52de36140de6de17d8306824acef5e39bbc3e119 SHA-256: a8f8bf5a35686f72fcd3688983ae03649d7a1be19c36e12ce1e2ab4930565d1b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9997

Heuristics 6

  • 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.
  • 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/wix?keyword=chemically+amplified+resist+materials PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419433/normal_605a1662ed89a.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/zexajapebekotu.pdfIn PDF document text
    • https://vomedizi.weebly.com/uploads/1/3/5/3/135312409/jepefirapirobidavari.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/1dc62b937159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_60053e5bac450.pdfIn PDF document text
    • https://geziduvugizi.weebly.com/uploads/1/3/4/8/134862990/20a69104ca274dc.pdfIn PDF document text
    • https://wulaludotesi.weebly.com/uploads/1/3/0/9/130969185/2549726.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/c07a752f83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5fe58a47dee5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xukorigukem.rf.gd/4796457930.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/pulmonary_fibrosis_exercise_guidelines.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_d2c4e33ef37b44d7a59a6c9ab5eaee92.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_c0190be4c8364e8cb10ea094a1c8cfc0.pdf?index=trueIn PDF document text
    • http://bedigetulo.epizy.com/why_does_my_chainsaw_keeps_stalling.pdfIn PDF document text
    • http://jaremov.rf.gd/kokes.pdfIn PDF document text
    • http://jovigoxuja.epizy.com/cricket_sound_effects_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/bemaponijurobuw.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_c4553853c9514c58ab9bf8ca899e9c7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/4_digit_addition_with_regrouping_worksheets_free.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_a24f36483f9245e8b4dca6cf7d060812.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_15e210d32bce40a08f08f322c688ac08.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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 5404 bytes
SHA-256: c52e7556bef35d1a9a672e3f3946ea6722720813ab2aaf48d568b97be23722fa
font_01_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 10436 bytes
SHA-256: 3b3f77797399cf96cf51aa00e4c6bdb8ff17b32804f8886f46a261f97d5bad3f

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