Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b7b19ced952273…

MALICIOUS

PDF

73.1 KB Created: 2020-11-26 19:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9e2eda55b1a916e2c8a97df5e1f0947 SHA-1: 77beb02e715ebb6f72143d8a950bcccd193fbd55 SHA-256: 77b7b19ced9522734d7d9afb1540db32f212b2dd476555d8c27e207d47c20992
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of URLs like 'https://trafffe.ru/123?utm_term=patagonia+social+media+strategy' indicates a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://trafffe.ru/123?utm_term=patagonia+social+media+strategy
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/9329073.pdf
    • https://duwusejirut.weebly.com/uploads/1/3/4/3/134370685/kogojomexo.pdf
    • https://cdn-cms.f-static.net/uploads/4459470/normal_5fad5f105e04f.pdf
    • https://wuvofujigu.weebly.com/uploads/1/3/4/6/134671616/vudapegibuxuzumulep.pdf
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/bedijenutowulixa.pdf
    • https://pifeposanitu.weebly.com/uploads/1/3/4/7/134753567/fe56b9ab2c198b.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/abbdaebd8f2f4.pdf
    • https://pupedabakonarow.weebly.com/uploads/1/3/4/7/134709410/mezekewapaseguva.pdf
    • https://jikonoligozeg.weebly.com/uploads/1/3/4/7/134755459/908673.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0aaae23-5beb-4255-aa73-3c163bcabc71/wezotazabupuferir.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/regaw.pdf
    • https://uploads.strikinglycdn.com/files/e967cf86-9db1-454a-a348-9fe9997524c7/wotarexuvaba.pdf
    • https://uploads.strikinglycdn.com/files/45e24343-e027-43d4-b503-1a35c069562b/46299015957.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d9.bin
1957aeaaad35f1cbb5955ff20779d86c5988da82d794ae9b7695add3da7e5b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 5360 bytes
font_01_sfnt_off0000f305.bin
edac276ed5831189108bdd7eadc1817738de8fc914965cbf7d92b1b1cce15baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 10568 bytes

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