Malicious PDF — malware analysis report

Static analysis result for SHA-256 02399e38901bf14b…

MALICIOUS

PDF

82.0 KB Created: 2021-02-18 18:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a9c2044db4118edc1744e39791a185f6 SHA-1: d1539c48df4bc175efe9361b45526bc5a5712812 SHA-256: 02399e38901bf14bed2faeed79150a65ec3394fbc9c224d3182a57e01c1b48bd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, including one pointing to 'jacksth.ru', suggesting it's part of a link farm or phishing campaign. The presence of PDF_SEO_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many external links. No scripts were extracted, but the PDF structure itself is leveraged to redirect users to potentially harmful 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://jacksth.ru/strik?utm_term=three+branches+of+government+rap+song+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375504/normal_5fcc23547acfb.pdfIn PDF document text
    • http://mklhhhh.space/epson_advanced_printer_driver_4_windows_10v5z0l.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/bafijezufugasev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5ff183bb4917d.pdfIn PDF document text
    • http://reetodo.online/greatest_common_factor_worksheet78bck.pdfIn PDF document text
    • http://teaitalis.space/manager_and_private_browser_apkhb0n4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5fe102cf74005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5fe4adc33dddc.pdfIn PDF document text
    • https://cdn.sqhk.co/fafegatoko/je39iWM/used_car_tax_calculator_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_601617836b2cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5fe3053644076.pdfIn PDF document text
    • http://podarokinsta365.site/health_assessment_in_nursing_5th_editionogr2q.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/8953597.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/WENjcge/55377561769.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/gjiijYX/evolved_beta_werewolf.pdfIn PDF document text
    • http://stat-index-co.com/asakuki_500ml_premium_manualwo4nx.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_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 5680 bytes
SHA-256: bf64027715daecace564db45f09b63b25bf97fd52a512b8ea202e464ef6f13f4
font_01_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 10852 bytes
SHA-256: 06e2347fe6807e1627543413737cf903f6d2fc84495631e2fa2b4fdfbaf45fcc

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