Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cec75363bae9c6e…

MALICIOUS

PDF

60.2 KB Created: 2021-01-10 12:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ba76dbdaacf2871f51a5a164dc81ba3c SHA-1: 8ba78720962841cecad40436a2bacaf020b256a5 SHA-256: 3cec75363bae9c6e8a0b999422736f7fb72175c04c6f3bdf8ab17fcfbd900cef
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 large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or engage in phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=company+brochure+template+vector PDF link annotation
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/tibuxo-logeka.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/UV0yt1A/download_game_gang_clash_mod_unlimited_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496616/normal_5fe29d969b746.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/malapodofevil.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/3733201.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
    • https://zalekekowijix.weebly.com/uploads/1/3/5/3/135346798/jatojada.pdfIn PDF document text
    • https://mazakodavowur.weebly.com/uploads/1/3/4/3/134335882/9324144.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/12a27186cb69c.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/vogokunajefirotagin.pdfIn PDF document text
    • https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/9bd3e8094.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/xajowu/camanche_trout_pond_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/sukewipibawubodosufelaz.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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 5200 bytes
SHA-256: 01c10a07ffb6c67a44f7da9190e9cd3aab56f90b4bd05fca38119809ad09af45
font_01_sfnt_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 9336 bytes
SHA-256: 921121ea202a72da82f168df52ae7107dde631c47375f2cc7ceb429d89a160bd

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