Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2191dd8983a57a5…

MALICIOUS

PDF

82.6 KB Created: 2021-05-19 13:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: df70f4d461f2a6c93cdb5fb578374a3c SHA-1: 82ffb608e067bfa228758bbb906dcfe5504b1d0b SHA-256: c2191dd8983a57a5bed1d8ea87fea990a922e9bf01c74488f5654c39e4f860f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=c%25C3%25A1ch+t%25E1%25BA%25A3i+minecraft+pe+1.2.8+ti%25E1%25BA%25BFng+vi%25E1%25BB%2587t+m%25E1%25BB%259Bi+nh%25E1%25BA%25A5t PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376875/normal_6057fb517187e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_602ea6884af97.pdfIn PDF document text
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/bovumevekibajab_kowivo_fapogi.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/goxidolakamuzov.pdfIn PDF document text
    • https://dadizatutelebi.weebly.com/uploads/1/3/1/0/131070904/5444874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fd75d4585332.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/zobokirozox-tivebexoxiguvuw-getorekemomidaw.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/4ba6239895dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389581/normal_605aefc2a1f42.pdfIn PDF document text
    • https://gevupuwelado.weebly.com/uploads/1/3/4/8/134894118/jizobelusorum.pdfIn PDF document text
    • https://bubamixidik.weebly.com/uploads/1/3/4/6/134657394/2389493.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/rugotuzibuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_5ffdfbb4920bc.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/baposivarabuj/gameloft_asphalt_8_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d90f64-8d99-4516-a75b-100d7a5f2aa2/71978780488.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/is_there_a_way_to_change_location_on_tinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ea957d-1f12-4bf9-8efc-c53f1275f859/secnavinst_5210.11_ssic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3749dbdf-d826-4649-be42-88f10f558d72/mary_poppins_returns_trailer_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43e7cf9-2d44-442f-9a78-f408dc6ceb37/color_de_la_leche_materna_los_primeros_dias.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_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 6856 bytes
SHA-256: 60b5ca4519804b7b216511a60e099109fc68b1373cb04cc7781a9e83825e235e
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 24228 bytes
SHA-256: 3c23e4c734270c104a9808598f9a1a06301629f110c18f050d6c990639c3d3d8

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