Malicious PDF — malware analysis report

Static analysis result for SHA-256 585ba2bc9fc8b076…

MALICIOUS

PDF

107.0 KB Created: 2021-05-29 06:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 38cd6a445d9fc8ab2f0d61db9eaa2dd7 SHA-1: b0fa1fc7a8da9fd85ff97b3a881f2cd6232b7d22 SHA-256: 585ba2bc9fc8b076a01ab4f78c4a06c0947d8b0f5ede8dfb69d1de1bce69a326
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a tactic to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or SEO spam campaign.

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://dugedepap.ru/123?utm_term=canonical+b-+form+dna PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390383/normal_601e3f96c0e25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fcca79f1f590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_604b9221c003c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459027/normal_606b88ac62b27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5ff6c900efd67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_600c73be544f7.pdfIn PDF document text
    • https://putujagojosid.weebly.com/uploads/1/3/0/7/130738675/3d810927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_605cb719c7b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_603159452eb3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_6046ddbe6ff73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_60411946780d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_6056f6883e795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_6060e434bf739.pdfIn PDF document text
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/suzijawaravux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447915/normal_5fdee4bc5d7a3.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/7434eca1-aa31-4312-ac0e-ea0fc91c34ca/download_carx_drift_racing_mod_apk_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af174299-de76-4e8d-b0f3-7f19b13e62c7/35735310154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/721628cf-2f2c-47ff-b148-dd47144acea5/war_of_the_worlds_original_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c034fa1-b8fb-4425-89f1-8c420cd12e1b/28419160943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88034a20-9b89-40fb-8309-824a868542b2/18766859253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c1e993-1a06-4e05-8f4a-b60cf003689b/speed_queen_commercial_washing_machine_parts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF7 5068 bytes
SHA-256: 399d3260e1b5d49aa0f06a314e60a946e18cfd58d08f1f98620a41d63544841a
font_01_sfnt_off00015f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1E 12472 bytes
SHA-256: dcda17bad4324193d79a3c4b177b39f67a16cdc1e2b3b4d77f9ff1038f90bb69
font_02_sfnt_off000189c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C5 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080

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