Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b9ecff077077bc…

MALICIOUS

PDF

68.6 KB Created: 2021-01-21 04:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9700aebf6ba4a8e49bc04ec7ef555eb9 SHA-1: 475ebe78b2f1889c472a474efbc1c1d354d606cb SHA-256: a7b9ecff077077bc24e04d08aacd53ba802261a706678e4205ccf72cf306e422
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with several pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious or spam content.

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://trafffi.ru/123?utm_term=new+balance+481+review PDF link annotation
    • https://cdn.sqhk.co/lewuravasu/iaGFxhc/pazaraxunifenefotitef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5fc2a838b569f.pdfIn PDF document text
    • https://cdn.sqhk.co/lidabofob/cIge4yJ/wajomeraxiwunewew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5fdf75a72dd2b.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/jgUZ0if/shadow_galaxy_note_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f9f39d592acd.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/KoheZhe/vodaxufekuvusujoxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/ejehaij/kunavisobakojowiwagemo.pdfIn PDF document text
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/zolelodemu.pdfIn PDF document text
    • https://cdn.sqhk.co/wulupumiwi/KjhiQWz/coordinate_graphing_interactive_games.pdfIn PDF document text
    • https://xaporavuxeboj.weebly.com/uploads/1/3/2/6/132695407/wobageruj_nuvuguti_winakuvevive.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/ihfidlE/ice_age_village_hack_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/zibojaje/sigibgi/pockets_billiards_san_antonio_tx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5fa163354b2aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobibuxasegisun.rf.gd/free_handwriting_letter_worksheets.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/vazexato.pdfIn PDF document text
    • http://pesuvomekujidi.rf.gd/wojofativawabarer.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/antigone_anouilh.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_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 5212 bytes
SHA-256: c70da0d2cbaa0dffda98245e0cb7059801e24d0fa7d14bb744a20c9e24d49907
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 10936 bytes
SHA-256: a87ff3305e4ac9aa326bfd14c4d0a807643e04398991b6fedb297b9e9ab1f6ae

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