Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d01dc58170627f…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 09:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c2dbf9ed58c1cef8b22d700a698de5cc SHA-1: ddbb90d9cddc61a83c833d27916338ec9a147b79 SHA-256: c7d01dc58170627fe62653053d948c4c9d96c8e0bc3e1c1c6329d2ef2484b401
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://seumenha.ru/award?keyword=how+to+make+compressed+earth+blocks+pdf PDF link annotation
    • https://cdn.sqhk.co/wakewafo/eGhigjc/laundry_basket_falling.pdfIn PDF document text
    • https://gerukule.weebly.com/uploads/1/3/1/6/131606739/d88e665da.pdfIn PDF document text
    • http://setifol.66ghz.com/63895808972.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/polufegowezote.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/GUiehgA/76374525287.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/e9Sq4Zr/99625589995.pdfIn PDF document text
    • https://sovezoku.weebly.com/uploads/1/3/4/7/134731827/bimasufevebazabupu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/eqhhjcw/zonusumasexelinoweja.pdfIn PDF document text
    • https://xudarusutovupaf.weebly.com/uploads/1/3/0/8/130814591/nijusebi-dilirutuberagax-mukutorovazul-wewuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/Xjijfag/will_it_crush_hack_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxutonugosafer.epizy.com/jedijinoxifijaxazajam.pdfIn PDF document text
    • http://fefuwosijar.rf.gd/simple_human_soap_dispenser_troubleshooting.pdfIn PDF document text
    • http://nixozokusujuku.epizy.com/98178557656.pdfIn PDF document text
    • http://daporanil.epizy.com/kolamofitugip.pdfIn PDF document text
    • http://rugupodat.epizy.com/43141428848.pdfIn PDF document text
    • http://xakilapug.epizy.com/32421376233.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/62973554016.pdfIn PDF document text
    • http://vujomigokije.rf.gd/22822244550.pdfIn PDF document text
    • http://vubukenod.rf.gd/60403889941.pdfIn 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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 5652 bytes
SHA-256: f7949b192bfd1fd01b1c132f79431509e2f9390fc914283eff9ec788a6c5a6b0
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 10380 bytes
SHA-256: bc610567f8f29d6f99d3c7a5b5fa308abc0de9aa071ccddfc3a39cbc9fac858f

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