Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b6192b3df6d61f…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 12:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8568cfe7af102407778cfadb7c0b0959 SHA-1: d21400299a36a39c866ff57f03fe6d70ce3c0c0d SHA-256: c7b6192b3df6d61f3318a070818fa139f452555288ef41f8981550bd9df963af
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF with embedded URLs, one of which is identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to factoring practice, suggesting a lure to disguise the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/award?keyword=factoring+binomials+practice+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422622/normal_601da59b16fff.pdfIn PDF document text
    • http://impergamon.com/american_born_chinese_character_mapr48f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_605133022197b.pdfIn PDF document text
    • http://bella24.xyz/gogidogenetisokolifenidamvl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_601bb6049d3a5.pdfIn PDF document text
    • http://presentinsta.site/blues_guitar_licksdkaex.pdfIn PDF document text
    • http://magicwoolshop.com/bd_singh_plant_breeding8pdgg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ffd433c3f08e.pdfIn PDF document text
    • http://xekumaluvox.iblogger.org/neruvogisesedaxux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabagez.rf.gd/almagel_drug_guide.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/jagujunujevevisexiwuxo.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/15375855505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0efba20c-620a-4a73-87ba-e06bc19129bb/tascam_424_mkii_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/valkyrie_profile_lenneth_android_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a33875-7b8f-4a92-864b-8e1d4ba61ea2/30303839112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd4a08e-d0fa-45c9-9cc3-9654f82f70a9/brady_games_final_fantasy_7_strategy_guide.pdfIn PDF document text
    • http://medidadebi.rf.gd/fascia_iliaca_ultrasound_guided.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/9179501365.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 5568 bytes
SHA-256: 1c35e690e77b0d60df53514dd595f51c1ca3ae7d61d69a205270b21021785603
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 11148 bytes
SHA-256: 5f22331b4bf748ba6300ef1d12a50167f7fdb6338b101e37057253da2755ecfd

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