Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9e455806cf5b38…

MALICIOUS

PDF

74.7 KB Created: 2021-01-14 05:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 33feed495a40455cff63095e7f9f8ebd SHA-1: d553d08b066b129b2fcfa3c7a122a292d3822503 SHA-256: 4a9e455806cf5b38d0527bc983c6baa387aa4aa6125a0750fd1597804d39498e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting an attempt to drive traffic to multiple sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious or deceptive 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://trafftec.ru/aws?utm_term=bollywood+movie++filmywap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452376/normal_5fbf3204b4b5b.pdfIn PDF document text
    • https://site-1177944.mozfiles.com/files/1177944/amazing_world_of_gumball_season_3_episode_8.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/wamazasizimukozer.pdfIn PDF document text
    • https://site-1175000.mozfiles.com/files/1175000/26233840168.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/kaxukok/41049057320.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/94090663628.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/ruxuwowetojebiwotep.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/harvard_referencing_guide_booklet.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/34014259552.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/section_5_firearms_act_1968_sentencing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/51274933955.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/l_c_d_c_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/dozakututipasirutuveje.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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 5216 bytes
SHA-256: a0711ad2f3932f99763ffd4da2513dc0c449ad07e1a5cb48b8da411107a72bba
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 10616 bytes
SHA-256: bcaa4834bb0b251e17e3d58c13ea037fb5132db3cb1de55c53eb4a3553c0b0ff

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