Malicious PDF — malware analysis report

Static analysis result for SHA-256 71483f746ccc582e…

MALICIOUS

PDF

83.1 KB Created: 2021-05-23 19:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 22badbd3b5f2bf4bd8a135a785f70fc6 SHA-1: 7e0d03c073e140bf03df029e78279af503dad499 SHA-256: 71483f746ccc582eb755ee1e0b17c31cbcdcc2d1949123fdcd39af38f843b548
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=zebco+slingshot+reel+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377101/normal_6044cebc2e194.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/velato.pdfIn PDF document text
    • https://gepinizidewepi.weebly.com/uploads/1/3/4/3/134305752/fofesoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_606b13c5e23f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_60084976a8adb.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/juzon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_603ed5cd3234e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_6008329a2f730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_606cd0484698b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_605c5aa8af692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_601193f48d73e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_60325f53af93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6020bf16e267e.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/lunojol/cabinet_pull_template_ace_hardware.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/disis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2212b67-4fa5-4c36-bfa3-1d47e02800ed/131706084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43a27b2-5a91-4282-8bb8-8760e1884705/pidasiparidimarege.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/abbyy_finereader_14_full_crack_sinhvienit.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/gekijaxinedunenaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c6d04b-97b6-46bb-9806-84fe6ccba014/does_yennefer_have_elven_blood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d63277-d09f-4b70-8463-590b6d599bd6/54979250588.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/kilujubowomimavojetuwamoj.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_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 4948 bytes
SHA-256: 0a3312545d1096c95adece5d358f432d38772e3b069043e3a72e8ca35d4697d0
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 11112 bytes
SHA-256: 8c51547b8c1f8e51902b1059fb7dc0c7021090944746ec3475372b23920f41c6

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