Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bec3342717a61f…

MALICIOUS

PDF

86.1 KB Created: 2021-02-21 15:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0aa073ae0aa48be5f77cd2efb56eb818 SHA-1: 50f0638d7e5dafdf40ceb4a74f49c9987daac338 SHA-256: 83bec3342717a61ff4077561f13c3eefb41fc710f6836cc1203e6ef1b377290e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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://seumenha.ru/wix?keyword=the+three-box+model+of+memory+includes+which+of+the+following PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366662/normal_60035df9770aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fe9b9ce3a8cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5ffb20eb36808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_602103709c7c9.pdfIn PDF document text
    • http://filanion.online/xiremg8ujv.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/8520025.pdfIn PDF document text
    • http://autokenn.com/jekabeniujvu3.pdfIn PDF document text
    • http://idealica-official.website/escalas_para_bajo_electrico_4_cuerdaskja1s.pdfIn PDF document text
    • http://arboozfilm.com/manualidades_para_navidad_con_madera_reciclada7zodu.pdfIn PDF document text
    • http://vir-tus.com/smartwatch_pokemon_go_plussybbf.pdfIn PDF document text
    • http://shopwithsale.website/malwarebytes_anti_malware_latest_version_freevow6u.pdfIn PDF document text
    • http://morpeoplelife.ru/chain_rule_problems_in_aptitudesdhw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485718/normal_5fcdfa7c0a025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_600b93ad93fd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 5608 bytes
SHA-256: a3b2e9cffd3998e4f654b5f267dfa5ab69b4aaff36cc3ecc44eba47e8d7de7fa
font_01_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 10192 bytes
SHA-256: 9353cac04ecd97259288281a50404eb7c2b191704de6e4aa0388dc4acda325e8
font_02_sfnt_off000131b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B6 17252 bytes
SHA-256: 40145b33efb535105b74dc07e54277151bbfc1d6e21af9658092d3e066ec5eeb

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