Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d9c27b7405020a…

MALICIOUS

PDF

72.7 KB Created: 2020-11-19 04:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 08373ed6c48bfeebc8c8a2a387bdb251 SHA-1: 16e2312ac8e1f2cc8dfb2db945644611c959d8e4 SHA-256: 41d9c27b7405020a495e9cac11eb25de6d27b55cbd595fa8ca68bfc408a5c7eb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically pointing to a large number of generated SEO links. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://traffset.ru/strik?utm_term=yuri+on+ice+dog PDF link annotation
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/linurigaruxox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f99723b72827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5fb3da904c457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5f90d8b981775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_5faf4ebc4d415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5f9beb90d1866.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/kamoradonume-kedimexivojofuv-jubuxogugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5f92de67930cb.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/ca06ff59-8b56-4a52-a84e-5120b58e8cbf/64052696927.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC125 3340 bytes
SHA-256: 692aceb35450d75544924282c05faaaa8c37627124def5513c5036944d110ad7
font_01_sfnt_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 4648 bytes
SHA-256: 13536f911abc20f1dc2ed2e237fe9c543ee4fceba501b01842ff6ebc160dfc47
font_02_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10492 bytes
SHA-256: adc8446a57b11262b548d386db5c9af1db617531c4d167351b7fbeb2afe0b621
font_03_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 16164 bytes
SHA-256: b21434860209bcfa4faa45743010641f853ea3cc1b0bad42541eb31f339e130c

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