Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25a683d3e870fb1…

MALICIOUS

PDF

110.9 KB Created: 2020-12-16 10:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 500dc60ff26e0caa52ff1769e72f6291 SHA-1: 7e0d4f347aa4571a29da37245cb233721d7ad246 SHA-256: b25a683d3e870fb1481ebd44741fa5ae57eef2eb0780c1d9588fa869db7bd3f8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirector services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dynatrap+dt2000xlp+replacement+bulbs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_5fadfa9e6456d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f8b141496a39.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/5faa81026.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/gagezedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f8cce99269c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5f8d602a31a2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fcaaf29ede29.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/padiri-gezirabenavaze.pdfIn PDF document text
    • https://dekobela.weebly.com/uploads/1/3/4/3/134332871/beponepikudow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fc67782cab4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_5fa65c20ef3ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_5fd16e18f22fb.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/54039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5fa1eeef23042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_5fc2bc7a5b148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf28045ca4f7902651b6b/1606218368861/93215996634.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_off00016c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C77 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off000176f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F9 5800 bytes
SHA-256: 8475fe4eca3b688c5d0a09dfb9af0ba12afb8a0a541a34006e421d541e2e2ab7
font_02_sfnt_off00018aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AAF 10304 bytes
SHA-256: 9387705ad3d509d43f765c1a998b26ecd9ed57b23de8b853293999e5e99ad6b1

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