Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd5bda1b41da317…

MALICIOUS

PDF

77.0 KB Created: 2020-12-25 21:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a6d66834e825f668901a2f3b0f5a07 SHA-1: 7d2dc021dc8d6cdbf07c3ba91262dab7f7a7ca5f SHA-256: bfd5bda1b41da3179d1b53a2bdd07346779cbdc3ad8e18d39265b8e4b8ae8deb
244 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or redirection lure. The presence of numerous external links, including one pointing to known malicious redirector infrastructure, suggests an attempt to lead users to harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://traffmen.ru/strik?utm_term=80+love+songs+playlist+youtube
    • https://cdn.sqhk.co/dadakafopina/fhfjegd/takokigetagovuru.pdf
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/lafegel.pdf
    • https://cdn.sqhk.co/tubafejog/2jb7gg7/34974389996.pdf
    • https://lidimegofomizut.weebly.com/uploads/1/3/1/3/131380930/vibidi-rumidir-xutak.pdf
    • https://winalefumigis.weebly.com/uploads/1/3/1/4/131437210/kizavosubodoles.pdf
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f8abf3a2674b.pdf
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5fca841ff27ae.pdf
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/898b7073c.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8d2a2c99cbd.pdf
    • https://static.s123-cdn-static.com/uploads/4485810/normal_5fcedd09b8676.pdf
    • https://static.s123-cdn-static.com/uploads/4411480/normal_5fe5926a31906.pdf
    • https://jizufolikoni.weebly.com/uploads/1/3/4/3/134349493/dumigi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/390339a1-ace5-41ae-92ce-d1fd6a122764/zonumo.pdf
    • https://uploads.strikinglycdn.com/files/319ad407-6412-4abb-8e9d-14ae0c2f5079/verbos_regulares_e_irregulares_en_ingles_mas_usados.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_off0000f1fe.bin
06500a2fd41fe7d528c1c66d6d61c6b2568866f14b646e8bf435cf3c20ad1181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 5432 bytes
font_01_sfnt_off00010498.bin
5e48aafe1d236c655b09099a5c01fc54fe9eab70da8f9ecc418d60591b0b763f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 10432 bytes

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