Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efeb4eca2eb1bd2…

MALICIOUS

PDF

70.3 KB Created: 2020-11-22 15:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab44f06aedf8ff5fa88e6263b2779d20 SHA-1: 792aacd381f6feb004c4d550a16272a13f147b0d SHA-256: 0efeb4eca2eb1bd2c4b915bd882dcff3b20ba7faef90c1d0352094cc05876c1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly hosted PDFs, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/wb?keyword=ihd%20ishares%20fact%20sheet PDF link annotation
    • https://rirubonoji.weebly.com/uploads/1/3/4/5/134528367/kamuxiwenapukaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f8d8dc14a3ad.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/1404829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fa6c746c770a.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1498243.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/e2a6dc17-2f56-4e0c-832b-d336f7462435/42605177565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8117cde-d7bd-47a0-938c-073f60a9efd4/karmic_astrology_retrogrades_and_rei.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f9d674-45bf-4b8f-b95a-ccbe7d4fde53/community_circle_questions_for_elementary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5283046-b26b-44b8-a0f5-29e3b15cd2f4/ousd_school_calendar_2018-19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64c15af-61c7-4aa5-8591-5f735402ec58/livobibodixip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff42c27e-2c87-43a1-a04a-a27a96fcf11d/zososaloteti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa2daaa-8418-419c-abcc-4ea7763e11ed/shell_helix_ultra_5w30_pds.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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 5012 bytes
SHA-256: fe967a735e7d6292d863625e1e3c54f90b25725da6270cc17f0a7d1054683335
font_01_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 10988 bytes
SHA-256: 82929be6d40ab8a6277b0a8edddc6cdcc11a5d90f7b1d5bee76c970daf11f810

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