Malicious PDF — malware analysis report

Static analysis result for SHA-256 7314f4d868a90973…

MALICIOUS

PDF

71.0 KB Created: 2021-01-13 17:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70fec72a8edb4e309f05b5e592a28289 SHA-1: d200c7deebcacc7d2a1b4f99f996617cb0f8c4b1 SHA-256: 7314f4d868a909730c47e252f8269df3e65a04f349bafe3b69b562784cd53e96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects. The primary malicious URL identified is trafftec.ru, likely used to host a phishing page or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=treatment+of+congestive+heart+failure+guidelines
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/2a8334a79666.pdf
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/7921d56dab752b.pdf
    • https://cdn-cms.f-static.net/uploads/4409818/normal_5faf9ae9a25ae.pdf
    • https://site-1168102.mozfiles.com/files/1168102/clash_of_clans_private_server_list.pdf
    • https://cdn-cms.f-static.net/uploads/4486971/normal_5fbb9f8f5f3e2.pdf
    • https://xefesikixote.weebly.com/uploads/1/3/1/4/131437823/9c5c2f7a1ee5.pdf
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f8cbf67619da.pdf
    • https://jidisozipu.weebly.com/uploads/1/3/4/4/134440811/kelorezudul.pdf
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/bojefajer.pdf
    • https://ditugapagijesap.weebly.com/uploads/1/3/4/6/134651304/banuzebukirid.pdf
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/3595382.pdf
    • https://sakuvida.weebly.com/uploads/1/3/0/7/130775714/fapobojeje-zalidusak.pdf
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5ffc631a5e2e5.pdf
    • https://site-1248725.mozfiles.com/files/1248725/iti_admission_maharashtra_form_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxivogedewilu/33203458910.pdf
    • https://s3.amazonaws.com/senodiw/adidas_men_s_shirt_size_guide.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_off0000d999.bin
c6a2055fbebd451dedd4978e6236ee6b118a8a40720fb93169f085223b5af300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 5444 bytes
font_01_sfnt_off0000ebf9.bin
df7c5fd894db9b5c82c7e27746e7d3de9150483021cc91656d6473963acbb704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10344 bytes

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