Malicious PDF — malware analysis report

Static analysis result for SHA-256 f269aa6862c97e88…

MALICIOUS

PDF

81.0 KB Created: 2021-03-13 23:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c8a95e5cbaad5037c31691e055ce120 SHA-1: 89931816b9db6c471196ef6b736ae27c0877b493 SHA-256: f269aa6862c97e8815acd72b9f7828dadcf6a90a6ff97df122ef1d670f677845
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing content. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary attack pattern is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=proform+750+cs+treadmill+parts
    • http://lexaxak.mywebcommunity.org/dazidesijamazizakutetot.pdf
    • https://cdn.sqhk.co/pevizopubok/hcTgiDL/sword_and_shield_dlc_pokemon.pdf
    • https://cdn.sqhk.co/wosuzumamig/Q0hh3Ts/37799642318.pdf
    • https://cdn.sqhk.co/goworonol/CgfqLMx/xodukenemuvaj.pdf
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/memojewuf.pdf
    • https://cdn.sqhk.co/soxuxopova/hlyUEgi/a_small_world_cup.pdf
    • https://cdn.sqhk.co/felolavap/CcEhd22/67963961844.pdf
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/04f9acee58d87.pdf
    • https://cdn.sqhk.co/ruvatagukas/jYzjjhg/nigadokupav.pdf
    • https://cdn.sqhk.co/lotidonita/duibVge/bully_lite_offline_apk.pdf
    • https://cdn.sqhk.co/kubabulukod/cjdidPR/kixinojaloreko.pdf
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/tojigewuzezinanubu.pdf
    • http://rofogukiluvupu.mygamesonline.org/research_approach_and_methodology.pdf
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/vebamo_pixelijoxaneg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zodofujeki.atwebpages.com/capitalization_review_worksheet.pdf
    • http://zudupaxub.myartsonline.com/panasonic_arc4_es8243aa_review.pdf
    • https://s3.amazonaws.com/penefelomiju/27576619899.pdf
    • https://s3.amazonaws.com/xuvamuba/94405679460.pdf
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_02ea2de856d1455a86c4c9da4adfbd8e.pdf?index=true
    • https://s3.amazonaws.com/salade/semat.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_3d64f99639bc4ac1a43a691da71ccc45.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f098.bin
6c8436002a980e49c8cde58958b1dfe1d554b80df43a0808747f3cdf425d40df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5328 bytes
font_01_sfnt_off000102b4.bin
80fc91872249d80045a22a0e436e0b82b2d5beac5b1e420f4c641e58683502ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 11124 bytes
font_02_sfnt_off000128af.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 4324 bytes

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