Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1656910f0c694a…

MALICIOUS

PDF

79.3 KB Created: 2021-03-01 08:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aec8c5533adf431ff1cc9db0e344fa6c SHA-1: 2235ec8053b7121de1d6639b49b658209aa95ce6 SHA-256: 2f1656910f0c694a29bafa37e8298251e92dfaf0b803dce3dd120432803076ea
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be a lure related to understanding science, which is then used to redirect users to these external sites.

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://leonvi.ru/123?utm_term=how+to+understand+science+better PDF link annotation
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/notivizetopoz-wodukulisaw-lereserigafe-tisiruviwabuwex.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/alcatel_a206g_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/y3jhrak/planet_mercury_number_of_satellites.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/hdgiXia/saxejesed.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/jezefoverum.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/gdMWhAT/1808553543.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/xipadiniwuna_lefexetikex_zirapi_rinozusodaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/diijjhj/masegosuvoligegizalede.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/V8uxjhD/fltplan_go_windows.pdfIn PDF document text
    • http://suxiselukex.66ghz.com/compact_android_mobile_phones.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/kurixomemiresupu.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/nosaxubafifovusenul.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/sZDAjbG/wood_carving_books_for_beginners_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/eighbic/96638371458.pdfIn PDF document text
    • http://tefituguj.iblogger.org/kilupofegujarigi.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/rededuv.pdfIn PDF document text
    • http://lixuzixewufixib.66ghz.com/burt_bacharach_white_house_performances.pdfIn PDF document text
    • https://wuvenenuw.weebly.com/uploads/1/3/1/3/131383928/fegizo-bulipokijonenon-sovafake-zaxonazati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://galapeb.epizy.com/56775456480.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_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 5092 bytes
SHA-256: 1065fb12dc4beac1bad332a2987746a3ac7cdc16f5361d34ceb485340c84651b
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 10456 bytes
SHA-256: c7522be6c0989ba5bfa737ae252574d55d30d058065d51a92aa600c450960795

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