Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3d7a4ab4211476…

MALICIOUS

PDF

90.3 KB Created: 2021-01-29 06:35:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d23d2568da33cd0f2012d59cf8cce4b2 SHA-1: 25a720c046146240198f86e83514fb7016d7d57b SHA-256: 8f3d7a4ab42114760e67b7d424d48ab2641bfa186c3b89869e64fcfca0988a4d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services commonly used for link farms or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

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://leonvi.ru/aws?utm_term=baie+de+brassage+informatique+en+anglais PDF link annotation
    • https://cdn.sqhk.co/puwupasakej/WBOjejj/2174730520.pdfIn PDF document text
    • http://maxufadewodov.22web.org/atorvastatin_mechanism_of_action.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/5M2jjxi/21760364166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_5fe79c98032db.pdfIn PDF document text
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/1396852.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/dbhcuhh/gokijuwugatunojazopuni.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/YZjbIhe/day_r_survival_premium_apk_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/rh9ihjM/32268919943.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454561/normal_6008826344cf9.pdfIn PDF document text
    • http://atomlinux.com/learn_html_coding_freeq3m8u.pdfIn PDF document text
    • http://mini-cam1.club/judoxugw2md2.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/cgdnUta/moduledatotax.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/igjdjjJ/solo_apk_for_android_10.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/ggfigge/65890064138.pdfIn PDF document text
    • http://trastqort.online/sky_force_reloaded_switch_guide6joef.pdfIn PDF document text
    • http://kmplitka.shop/usce_beograd_kontaktjdtc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tezogaxexinaga.rf.gd/93003697546.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012a1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A1D 27348 bytes
SHA-256: 4c9833c46158b8bb40cd84acbf51fef0d7852419fdbc7bba4f98ecec95c1812f
font_00_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 5544 bytes
SHA-256: 05ea6faf695ea6206f7e3f2d812fdc649baf815440a2da95a9734f9041a28acd
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 11908 bytes
SHA-256: b0491822f1ad21f1fecf8575456f50173a6bf57e72db3fcca3a582576b12cb53

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