Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6db9c0d789172d8…

MALICIOUS

PDF

75.5 KB Created: 2021-03-01 22:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cba3b8c8f88c99b4ae623cae1c116db5 SHA-1: 7e701926e417a6fe46201f4ac78902bde54eba29 SHA-256: b6db9c0d789172d8a345202dea3e4b5088ce642c3babc546329a1a6bc03910f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and ClamAV detection as a phishing trojan. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly 'https://pelibifir.ru/123?utm_term=should+i+buy+a+wii+u+in+2020', suggest a phishing or malicious redirection attempt. The presence of numerous external links points towards an attempt to distribute or redirect to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://pelibifir.ru/123?utm_term=should+i+buy+a+wii+u+in+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5ffe26435a9fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454430/normal_5fe23bb39c7af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_601b42e2bf17c.pdfIn PDF document text
    • http://tujomof.22web.org/boss_movie_video_song_tinyjuke.pdfIn PDF document text
    • https://cdn.sqhk.co/jokutevek/xUMiagC/the_inner_world_of_the_immigrant_child.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/aa55ea46.pdfIn PDF document text
    • http://linorusani.iblogger.org/gukajexad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_601207c439a7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5ff05bdb7eae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ff4ad640c9eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_6028f3b9cb664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muparokaxewidad.rf.gd/xakafejakubupaga.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/74947444798.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/hiking_fansipan_without_a_guide.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5348 bytes
SHA-256: 369a57ce7e0c4d4e0811b92cc2f2cc51279faa94f5cf5ba940d0a4622295b437
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10892 bytes
SHA-256: 1cc16e7987e877a496943ffd0ee122cd7874619527dc7388f33b19c7455a4840

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