Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6da7fc52a53b58…

MALICIOUS

PDF

69.7 KB Created: 2021-01-05 18:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8f48f6b661be5cbb3cb11007b9c29a22 SHA-1: 74b123e5692fd4770d4fcdfc1a71a40286a883e9 SHA-256: cd6da7fc52a53b581a0aafdab13417e28102109a1bdc4882dfac64eaca9d0234
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://traffnew.ru/123?utm_term=oster+stainless+steel+1100+watt+microwave+oven PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f89cf9b4dcee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f895eb52b863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fcbc5bff37c2.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/26e9b8107.pdfIn PDF document text
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/b89b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414175/normal_5fc5ce3048688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5f984b75534dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5fe36131be4ca.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/4a3cc98d-f5cf-4064-9701-1247e38a3dc0/jesasipesepubibifap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1204126d-6fb9-4510-a71d-a5e0880c1103/waramegumurimovuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eebc0b9-d569-451c-9b78-94a0fcab52be/bobuzofagex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee3fde6-7613-4c21-b2df-b9f718480f9e/vopejilomatuguju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b24fdd5-68b5-4313-8ca1-d8c5899349a4/an_age_of_kings_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51345942-a2a2-4e80-8236-5875704889e9/nebetumevenorunu.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_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 5320 bytes
SHA-256: 8aecbe106c876ed476ea87786af848ebd393f99a758fd3d6905054d71f5a92ca
font_01_sfnt_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 11436 bytes
SHA-256: 0a4602a48ce1dd2a4dcf4b496d243019cde4de11daddc31a8432826d62bcbd3b

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