Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1ab20eb8a584e3…

MALICIOUS

PDF

78.1 KB Created: 2021-02-19 07:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c11f03ed1ff0f326a822d4e55ba066fb SHA-1: 20e005c11f6f786d93208223ac7bfa5f8d878f6c SHA-256: 7f1ab20eb8a584e3a21ebfc5f2ec8b2f324e4989978269b54824e3263c64d52a
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and a link farm. The embedded URLs, such as 'https://yafferge.ru/strik?utm_term=mito+de+la+caverna+de+platon+resumen+pdf', likely lead to phishing or malware distribution sites. The document's structure suggests it's designed to host a large number of links to disposable domains, a common tactic for SEO poisoning or distributing malicious 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=mito+de+la+caverna+de+platon+resumen+pdf In PDF document text
    • https://cdn.sqhk.co/kawiwitifa/hcyogjR/31603757361.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/52342e841a87a.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/sariwukapofo.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/lhiKhaY/smashing_pumpkins_glass_and_the_ghost_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/bijininabex/hdgcmhd/pregnancy_week_by_week_babycenter.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/1587647.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/j6geejb/socialgest_programar_instagram.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/galenigexezujim.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/mogafuzuxudaniluraw.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/qWigGhe/30034479884.pdfIn PDF document text
    • https://vixojuderapu.weebly.com/uploads/1/3/2/3/132303060/dajipex-wukigodinegemip-gatakenujowufi-kanuta.pdfIn PDF document text
    • http://allrecipes.pro/ball_blast_cheatsxjuub.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/5485993.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jY6ichc/19213056723.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/oyEijhc/24048029513.pdfIn PDF document text
    • https://dojunulopifo.weebly.com/uploads/1/3/4/4/134445836/susen_meredodor.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/xixudarixa.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/8hgfjf3/94627786691.pdfIn PDF document text
    • http://lafuvenilimagi.iblogger.org/fortigate_100f_datasheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genufewewirim.rf.gd/43237938648.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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 5368 bytes
SHA-256: e90051dd2d9b380c6d6cc95ebfd093980213b78db713d6827bd90395a65a3d53
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 11660 bytes
SHA-256: 8920b546decd7e51df16f6ba1cd09a70be8bd2692146aec854b5d68c6a7a90f5