Malicious PDF — malware analysis report

Static analysis result for SHA-256 215a26b781198a69…

MALICIOUS

PDF

71.4 KB Created: 2021-03-20 22:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e83d013772eaf1c93710e5f6a96ac0a SHA-1: b7b72827c5446bb759aad8b558c6922ce90aada0 SHA-256: 215a26b781198a69d7df71ba747b0074c360d54233404c12ea6261c5d94e1b35
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various PDF files hosted on different domains, some of which are flagged as disposable. The primary URL, https://jacksth.ru/aws?utm_term=dias+feriados+del+gobierno+de+pr, suggests a potential phishing lure related to government holidays. No scripts were extracted, but the structure and numerous external links indicate a likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://jacksth.ru/aws?utm_term=dias+feriados+del+gobierno+de+pr
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fc693e396b6a.pdf
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/4038727.pdf
    • https://cdn-cms.f-static.net/uploads/4464297/normal_60278c1596ac4.pdf
    • http://lewulumotuf.iblogger.org/nuxusifupoganezajaz.pdf
    • https://cdn-cms.f-static.net/uploads/4502511/normal_6046065181b7f.pdf
    • https://cdn.sqhk.co/pivugisaxap/ciggj4G/vofewobunaregodumeti.pdf
    • https://cdn-cms.f-static.net/uploads/4411491/normal_5fd8b4c205018.pdf
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/kimusufewejanim_sovotekoko.pdf
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/8960173.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/7994234.pdf
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/piwikowosowam.pdf
    • https://cdn-cms.f-static.net/uploads/4420917/normal_60399b688a132.pdf
    • https://dewebunofimob.weebly.com/uploads/1/3/3/9/133986907/nusedizuwevewadomo.pdf
    • https://cdn.sqhk.co/moxufupog/Y9Giijj/73680068074.pdf
    • https://nulabelavomeviz.weebly.com/uploads/1/3/1/4/131413951/rugolidejenomabo.pdf
    • https://cdn.sqhk.co/razilipot/iYKzegd/identity_v_hunter_tier_list_season_11.pdf
    • https://cdn.sqhk.co/kitujesijak/JhfEso5/immigration_nation_netflix_documentary.pdf
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/a0530377.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_d4fe5b464a84462c964c7c3d5d4c9fd4.pdf?index=true
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_53e1a80c5c8b4fd99916ea53759b90bc.pdf?index=true
    • http://xefubadopevabe.epizy.com/lozagemo.pdf
    • http://xoviketi.epizy.com/vertical_and_horizontal_asymptotes_worksheet.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d746.bin
e907d4df656d11b1754a109bd7396beb65894fea1d2825c5ff4facdd9cb2f802		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 5348 bytes
font_01_sfnt_off0000e97f.bin
f0f3172e9c543176cb96186110251229bfdf93391ea7c8ff25d4af7766c7917e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 11280 bytes

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