Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e07b9cb08e701f…

MALICIOUS

PDF

82.0 KB Created: 2021-05-23 09:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c070e7bb1684caf636ad6df9cda56e93 SHA-1: 28cb7567d9cb3feb61122604a16033cfe7801b33 SHA-256: f6e07b9cb08e701f85e531d66e354cd20e28149579508fd543236aa566be1169
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to 'mezovuduw.ru'. Heuristics indicate this is a phishing attempt, and ClamAV detection confirms it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to be a lure related to a printer manual, suggesting a social engineering tactic to encourage link clicks.

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://mezovuduw.ru/strik?utm_term=hp+officejet+j4580+all-in-one+printer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367313/normal_6013007cbe96c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5fd1e390af536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6021ceab89b24.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/sefadajowu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5febd50938ca3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449614/normal_6003aadfdaa66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5fd890bb6dd7e.pdfIn PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/puxasagag-bisirogekifo-daxovuwunomo-fosativ.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_604111cd7d0f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_60549e9da1331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5fcb9b809acee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd61c63b6129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5ff797c7d8c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_6040dfb8b9f6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6b5fc9-0374-405c-813f-97414ac3e6a1/98981917870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0334a7-3a01-4b1b-8143-84482ab3e4e4/repexoguxifelupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a1be38-6097-435d-8455-9c0c6b704a20/15966628846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134a6790-c512-4b8d-aa71-2ce266790406/84544885731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da66e818-69e8-4293-a64e-bed130ccaef8/neato_botvac_d75_error_3000.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_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 5600 bytes
SHA-256: 2e8278898f8e70b81c4253a236d58aba32e7d744b0926989c8f856fb9fff3c5c
font_01_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 10356 bytes
SHA-256: e13a0dc243d679061a0e09531b0e7057b05a3e977a19f8d6e2728bd19b63edd7

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