Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9844c7e527f1ca…

MALICIOUS

PDF

92.3 KB Created: 2021-01-12 12:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3d8f483923e2cf00a32bbd534abce5e9 SHA-1: 5dcc9e2ccfe9ab61afbf2740904d0279cfa4ab37 SHA-256: 2c9844c7e527f1ca90292668f6c231c8f826ea8ed63dc044066bd816bcd06438
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 domains and configured as a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

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 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://traffnew.ru/aws?utm_term=after+effect++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480414/normal_5fd6a0a6b2a70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5fc604091b884.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/7085839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5fa22cb859f03.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/dovatuv-solabilegadof-deravejubareweb-buvafog.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/gezifiwisujedek-mawovili-lavowiziwazemem.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/xekivajavurudowijop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8ae8b1529e6.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/692251.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/5261305.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/01dbf4bb71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_5faee435c3761.pdfIn PDF document text
    • https://site-1168537.mozfiles.com/files/1168537/miperog.pdfIn PDF document text
    • https://cdn.sqhk.co/gewigerajoru/UWgcnSM/planet_fitness_membership_fees_during_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/icibuhg/tuning_motorcraft_2100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/natidinekavanuze.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/vufun.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_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 4444 bytes
SHA-256: 1e4127e99a54e62b60c7c816c24bfc08a360e7287484dd673e450d3b60f8ca7e
font_01_sfnt_off00013fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 10724 bytes
SHA-256: e5a535f2b91d266063cb3f70c4d9dc984854267612afa8d08234f23d347a4271

Open this report in the interactive analyzer, or submit your own file for analysis.