Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c2110c2c450d4c…

MALICIOUS

PDF

62.7 KB Created: 2020-11-25 22:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 60211e82ef0d12a2d2c71c8508b19b19 SHA-1: c8d2652e3dd5f8c9d1eccc1d04ad9e23ff62d123 SHA-256: 18c2110c2c450d4caff6b8bc735d199f3899ffd645e1210f5f5b2f43af223c3f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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
  • 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.
  • 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://traffine.ru/strik?utm_term=wild+garlic+plants+for+sale PDF link annotation
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/vefomame-sezuralovuw.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/5366023.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/9688826.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/76cc774d0a.pdfIn PDF document text
    • https://julefezi.weebly.com/uploads/1/3/4/1/134131413/kekuw.pdfIn PDF document text
    • https://biwewijusegi.weebly.com/uploads/1/3/4/5/134586848/gizesitasi_tusimuloder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_5fa169fd26bcd.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/gufopokidobitinezud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5f937ac53f3e5.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/0bb78c5306a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f910e545499d.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/ee889d09-bbd9-4fbe-92df-6b2a387e2940/xefutuser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e3e04d-f80e-4c02-a7af-9a185316aa3c/target_return_policy_no_receipt_baby_registry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921cefd8-01cd-49c8-89d7-561f72105635/49615180319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be04dc0-79f2-44b3-82e9-9b97a6bb8320/jijolajugixibesirawepid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EC 5336 bytes
SHA-256: 145ef3fad67b757e5ae1d3f99e8c200fffd04a2b4fdd4f35322969c7bb0d381f
font_01_sfnt_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 10336 bytes
SHA-256: fa7a00da17e9097c6e86fb943e83fa5d739ced99d7cc6253b860f0a116252381

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