Malicious PDF — malware analysis report

Static analysis result for SHA-256 71792d6c531e6909…

MALICIOUS

PDF

88.3 KB Created: 2021-01-06 07:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 547bb3f32b07d66720d4970512539b00 SHA-1: 73fc33e0002fb89bf5bd700dd000ad9249cbc8d8 SHA-256: 71792d6c531e69092e85f88b701f243b67b221e77ed0ae03afd8a293d10c07de
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it contains numerous external links. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://trafftec.ru/aws?utm_term=land+reform+meaning+in+tagalog' and a link farm hosted on weebly.com, are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=land+reform+meaning+in+tagalog
    • https://bunavomotuta.weebly.com/uploads/1/3/4/6/134606544/wixujusi-nexebigaw-xomelo-jikux.pdf
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/cda8dd91c906.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5fa0cddc14b46.pdf
    • https://cdn-cms.f-static.net/uploads/4500904/normal_5fafd9429991f.pdf
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f9109bcebc8c.pdf
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5fb2813729c7b.pdf
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5fc24b02dd4b5.pdf
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/4919293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a7a7c826-ed38-43c5-9668-a6a3d54b2cd5/pemikejidarotanawakol.pdf
    • https://uploads.strikinglycdn.com/files/e8e42b10-2a48-49b2-849e-c3e205199582/86154332406.pdf
    • https://uploads.strikinglycdn.com/files/6f466cf7-bb25-4cf1-a4eb-a01f648005d8/stores_material_within_the_cell_biology.pdf
    • https://uploads.strikinglycdn.com/files/1dc0a728-ed9e-413f-9735-1dedb3be4d8d/project_manager_jobs_denver.pdf
    • https://uploads.strikinglycdn.com/files/ca0746f2-1410-46d5-91f4-c64483a3a404/who_are_the_folk.pdf
    • https://s3.amazonaws.com/wovitiku/92755281485.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c3a.bin
a4862da185e53e7e1f00104e90811ecdc41f421c679fe02dc9617ccd089f0eb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 4988 bytes
font_01_sfnt_off00012d20.bin
9e97b19de1f1529d0a1847f3fdef36fe7bbdd81aa31edd22f7d89daf9cd14136
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 12180 bytes