Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e37936e88cbe48…

MALICIOUS

PDF

66.6 KB Created: 2020-11-17 23:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 72adf59df278a4237a9526b192145e1b SHA-1: ed6f6b14eae90cbd064c2972a5e7fe5f1811f034 SHA-256: f4e37936e88cbe489d2af5137e7d125c50a2f52cfd70ec73ae20cb64849d7940
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external links, with one prominent example being 'https://damokilusul.weebly.com/uploads/1/3/4/4/134463963/pusafolanuluxiku.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the detection suggest it could be used to download or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=advertising+and+integrated+brand+promotion+7th+edition PDF link annotation
    • https://damokilusul.weebly.com/uploads/1/3/4/4/134463963/pusafolanuluxiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_5fa7db74057ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5fabb59e2b528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5fa07c9841224.pdfIn PDF document text
    • https://jamobosis.weebly.com/uploads/1/3/4/6/134684796/946392bf.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/dukajevo/ae_character_alt_code.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/leyes_de_newton_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/macromedia_freehand_9.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/text_now_app_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065fdba5-065a-4112-aa1a-20b12cd35e2f/bavepowijofuba.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_off0000c505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 5608 bytes
SHA-256: 6346beda25bf452657fddf3a87dd8e74241c5a2d587f9cf3a4223daf01a6463a
font_01_sfnt_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10980 bytes
SHA-256: 428b514d5dc9906c9e2ecbcf190a5fa0fb12f23a7de015fe935edb0ff41ca0e8

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