Malicious PDF — malware analysis report

Static analysis result for SHA-256 598189e5a8445129…

MALICIOUS

PDF

91.3 KB Created: 2021-06-03 05:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7a9227e9035c58980809a751f854a30f SHA-1: d304e66b25a52e27d3e1f198d90bf3fe9a9a8e25 SHA-256: 598189e5a8445129a8bdd92054a5939058780613d4505657529823c13c6c3cc3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or potentially download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://huntic.ru/pbw?utm_term=does+flat+tummy+tea+works PDF link annotation
    • https://nugukofijopi.weebly.com/uploads/1/3/2/7/132712180/4176002.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/27dc3005ab3a.pdfIn PDF document text
    • https://nusokusin.weebly.com/uploads/1/3/4/3/134350978/nuxirubizajamakadi.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/xatezurit_kelunopogipe_purewowaf_lutexolu.pdfIn PDF document text
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/sogojimovib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_603bdec257b3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459941/normal_6002d8525c3e7.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/7803382.pdfIn PDF document text
    • https://didunebufanef.weebly.com/uploads/1/3/4/6/134680758/8413877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_600538adab85f.pdfIn PDF document text
    • https://sulovuve.weebly.com/uploads/1/3/5/9/135973568/1048117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fdf9b62c6d15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420910/normal_5fc79fbd3b6ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_602c5af1f2276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5fe44ccf7990a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memofemovo.pbworks.com/f/fivodemigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcfe528-215f-497a-8382-bd71b3ee1ea7/what_was_the_religion_of_the_babylonians.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed762219-5d9a-4686-9b36-54711d523d6b/fiwuvizowavoposadin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83be64cc-d43d-4b10-8e4a-fe00bd065037/76362463017.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144535731/75099867454.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144524178/how_much_does_a_hastens_bed_cost.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_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 5168 bytes
SHA-256: 2ccf567bf5ddf4c9ea53f372a2e992056faf8ec6abac1cfb56ef7c737ba3d3d2
font_01_sfnt_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 11252 bytes
SHA-256: f602ab9f8500585d1544ca5fa4bcf97a62beaca93984b35ba36b74df4a2b5e8e