Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c77b5f4985b1b67…

MALICIOUS

PDF

70.1 KB Created: 2020-11-24 17:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68592950020d6da5343865ae9cebe390 SHA-1: 97de93ca172915cf622968cfb84b6e458f18dbf3 SHA-256: 6c77b5f4985b1b679e70a2288bd2a6d75144eda0570d962919ad29a0f56c2d8a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=flawless+consulting+a+guide+to+getting+your+expertise+used+pdf
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/4066092.pdf
    • https://cdn-cms.f-static.net/uploads/4391340/normal_5f95a3ace1ede.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/nesubine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8828acc5-a181-4a6d-bbef-668b745a3999/imagenes_con_la_letra_e_para_colorear.pdf
    • https://uploads.strikinglycdn.com/files/1e1693d0-e1df-4fcc-bbd2-6491653efbb3/wonotinabezepasarajuvow.pdf
    • https://s3.amazonaws.com/pafiganovavi/chote_raja_song_kinjal_dave.pdf
    • https://uploads.strikinglycdn.com/files/ee1b7213-222e-4d51-a017-bcb6d61d545d/wetopidisoder.pdf
    • https://uploads.strikinglycdn.com/files/59e469ce-f449-4ec0-bc0a-cb84d1918f37/wikanorefekolitumitoxumo.pdf
    • https://uploads.strikinglycdn.com/files/1a752bc5-0d86-443d-9ab1-567514d16b14/psn_free_codes_no_survey_no_verification.pdf
    • https://uploads.strikinglycdn.com/files/0228698f-e092-4b53-ba1c-99f3e6cb6a63/29348658847.pdf
    • https://uploads.strikinglycdn.com/files/fecefd38-a4e0-49f9-98c8-f028b2dd206f/celal_ile_ceren_tek_para.pdf
    • https://s3.amazonaws.com/suximawo/essential_questions_poetry_elementary.pdf
    • https://uploads.strikinglycdn.com/files/e07584ab-72ef-42da-821f-13aa68d57dd8/86046827028.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_off0000d51a.bin
18f5ebd1892e9491b08380627410e1f11ca4387bb75894fa2866971ac6aa1abf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 5540 bytes
font_01_sfnt_off0000e820.bin
b2397f5ad9af6dcc695e06203e3d7338dd121de17f24e9ad51704e81c20ccc13
pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 10216 bytes