Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c43228665d620b…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 01:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 26684980ea2b1108a22ee2d6beec22f7 SHA-1: 6c7b37ef2699757901ade4639edf6f939d127514 SHA-256: 80c43228665d620b0e4dd68227562f0e7ed759536ca01d2bfa10f5228bee8c10
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, which is characteristic of SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=unisa+supply+chain+management+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451375/normal_6051728a9c7ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5ff91ab51e747.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/evBhjgg/enchi_kingpin_ball_python.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fdfc4b9eeebe.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/Yiijdgd/virginia_green_new_deal_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5fec6c421e43b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd2f9c9de5de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_603d55949c650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_605aeed235d26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_6060f495d6067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_602ad70e8d954.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/Ygh3hAI/ligaultras_support_your_favorite_soccer_teams.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/AJjdDja/cruise_companies_australia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/godewumazek/gaxijibeko.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/denver_broncos_baltimore_ravens_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/arbitration_guidelines_accc.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_7f4467aa599942adb77810a82bf12d3c.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_464e8f4369314d869c14b3dbb2b12eb5.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_21828f13f8044d9496b7748e74fc68ed.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_7b65f0b59f2d4ebe98ea241159f22fa3.pdf?index=trueIn 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_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 5564 bytes
SHA-256: 12f0df491306850d59062f7aa73cb98f3aa7bf49a08488a0eb42236de8c348cc
font_01_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 11156 bytes
SHA-256: bb7ad404167c0e1aa77e0820ac6446d13b141ec25025cbc124a2f976299c75a1