Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1af31d35b545e2…

MALICIOUS

PDF

75.8 KB Created: 2021-01-11 12:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 109f4245ff48f72a5b141067f8157f0d SHA-1: 927d6dbe78a8ca72c0a3ee33ebb44ba8dc047038 SHA-256: 4d1af31d35b545e2e3b3dabac84b030a0df8d3b8da7a5ef00bbe62c6bd829b40
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?utm_term=great+depression+causes+worksheet In PDF document text
    • https://zotizoju.weebly.com/uploads/1/3/5/3/135349435/sibapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5fa51ccd6293c.pdfIn PDF document text
    • https://cdn.sqhk.co/jikogifuxa/7ShdCgj/vanuk.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/2959167.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/9626592.pdfIn PDF document text
    • https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/juvusakud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fd23642cadbc.pdfIn PDF document text
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/df82375fb4.pdfIn PDF document text
    • https://site-1171372.mozfiles.com/files/1171372/nefuga.pdfIn PDF document text
    • https://zuragani.weebly.com/uploads/1/3/1/4/131438510/dobox-xoxosokin.pdfIn PDF document text
    • https://site-1199436.mozfiles.com/files/1199436/boduz.pdfIn PDF document text
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/revosutozoduwe_sowafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 5200 bytes
SHA-256: 978d5f7b63f075e5116e8b51f2ef4b48375d8ea2bcbdee77dc2b5c85a7a8dee3
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 9944 bytes
SHA-256: 82f51c644ab03ed9375a106e5c4db7036e6d5b1279449fbc787e3c54cfa82648
font_02_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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