Malicious PDF — malware analysis report

Static analysis result for SHA-256 293437c1bcf41701…

MALICIOUS

PDF

75.0 KB Created: 2021-01-14 10:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0c17dcecb0206306c013d385dae2f3db SHA-1: 7bad4949616d2849d8f1f670067cf697ee489014 SHA-256: 293437c1bcf41701a7cd1da30f8c6270426947ca2c20e1d2c6606e2d9467b0b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 28 external links. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of external links and the classification strongly suggest a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=rosario+catolico+para+imprimir PDF link annotation
    • https://site-1184682.mozfiles.com/files/1184682/zigeguma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fe11414ce3d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5fca5f33a15d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_5fbe24e6cd93d.pdfIn PDF document text
    • https://site-1168348.mozfiles.com/files/1168348/88306614666.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/O5pgege/playrix_stock_ticker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5fdd7822804d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5fb85c8747fb6.pdfIn PDF document text
    • https://site-1203147.mozfiles.com/files/1203147/senate_majority_leader.pdfIn PDF document text
    • https://site-1233197.mozfiles.com/files/1233197/arabic_ringtone_1_hour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_5fdc14805419f.pdfIn PDF document text
    • https://warefoboba.weebly.com/uploads/1/3/4/6/134669172/48dd852473dc1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5ff77326d6011.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/f8447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 5084 bytes
SHA-256: ff6e0599a09ea6133e5905ed804244baa913f61b67f08b7f223f44b9a0971c4e
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 11520 bytes
SHA-256: 73acb7d451ea0f831c711332c53edfbb2cd2e8cf8635f4b1e63aea4ad6878bc2

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