Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb5ac9faa2c10f6…

MALICIOUS

PDF

71.1 KB Created: 2021-05-30 03:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 800564cd4a05df98ca9d72709a888a39 SHA-1: 1efd3756d91f9de4ed3b3aa16393aa00f797b680 SHA-256: 8bb5ac9faa2c10f6c28acf0618ac0e69c2e7089a49d75338e8c69c5e9bef2fe5
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=early+humans+worksheets+grade+6 PDF link annotation
    • https://kofeguku.weebly.com/uploads/1/3/4/5/134587943/b9cb60.pdfIn PDF document text
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/musige_kesopamizixofas.pdfIn PDF document text
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/9115836.pdfIn PDF document text
    • https://dukidisivaturan.weebly.com/uploads/1/3/5/3/135311912/43c9037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5febbea9efecb.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/tuluranalud-nigabelazuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5fdb0ff832923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404490/normal_5ff47c315c60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fd10e5f64211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fd2f14e2cb12.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/c6c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_603c5d7aebf75.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387929/normal_60b07defdc18e.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/guluwudesemap-bezevara-xosujex-palowodumojago.pdfIn PDF document text
    • https://jirakevajiw.weebly.com/uploads/1/3/5/9/135966085/ruleva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476445/normal_5fcbf34ebc7c7.pdfIn PDF document text
    • https://purusexubike.weebly.com/uploads/1/3/4/0/134000510/4010069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_6054e8ec68147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/511e75ff-a889-4d0f-a169-eb5be267cc40/reusable_swiffer_wet_jet_pads_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca14025-939e-4a0a-a5dd-0f45ba56a442/wovonewutuporetomawif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9137ffac-81e5-41e1-a07b-5baad408fa83/how_much_does_someone_with_a_sociology_degree_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287762b1-e152-43db-ae14-c768e67eaaf0/31083893580.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 5608 bytes
SHA-256: 44982553da204e346c10c2444ee2b2b50275de494df4ab395a72a2d93bd567ac
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 11028 bytes
SHA-256: 3d4906df61bc15d74f3f423b0751c809172a0a664e214c424e71ab14cc5748b6

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