Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5a76c8a893557b…

MALICIOUS

PDF

72.3 KB Created: 2020-12-24 23:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2f85dc1bbd74e76cea86ff83540e51a7 SHA-1: 099f447f11ad2bec7763a9064d15509792aee7e0 SHA-256: dc5a76c8a893557b6883efcd72345fc4244fd6ac8793007ff801fb17d5d3422c
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to 'traffmen.ru' and a large number of external PDF links hosted on disposable domains, indicative of a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/123?utm_term=laird+of+dunans+castle+fake In PDF document text
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/90844672c9.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/1486435.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/BdjgjjS/download_game_cartoon_war_gunner_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5f98021b92df7.pdfIn PDF document text
    • https://lumosezuto.weebly.com/uploads/1/3/4/4/134499790/cb9c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5f93802864c09.pdfIn PDF document text
    • https://fofavaduk.weebly.com/uploads/1/3/4/4/134436242/sevulavekere_nafilob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461250/normal_5fcb55a42a096.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/80d0c.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
    • https://uploads.strikinglycdn.com/files/e57a6bab-1e79-40d1-8f4e-2bde397638bd/kuzefabuki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 4900 bytes
SHA-256: 66dbe7e40aeeb7382b9425305ee2fbfcdb6359b42e7a62637091e8f705d7d69f
font_01_sfnt_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 11028 bytes
SHA-256: 7896e0e40422b8b6ff3680273aec76d8d2e0587ab7ac480cad8cf826973aa41c
font_02_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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