Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29087ed40d94d43…

MALICIOUS

PDF

74.1 KB Created: 2020-12-25 15:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f1ead42ad59277d088dbcd3640e5dfbf SHA-1: ebea6b5f48780c2a5d7a56aa2f5e7691ecd06a68 SHA-256: c29087ed40d94d4329284cac360d33b73535dae6ff61c2eb2227f53995b4cfb1
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URL `https://trafficel.ru/123?utm_term=beware+of+the+dog+gif` suggests a phishing or malicious redirection attempt, likely part of a link farm strategy. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=beware+of+the+dog+gif PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5fc160c24b1ca.pdfIn PDF document text
    • https://gerunujixode.weebly.com/uploads/1/3/1/6/131606408/kurisir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5faedc0891e1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_5fa2e8587626a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462376/normal_5fbbde5f608c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_5f9c9f874aa14.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/pidewawafiguvurema.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/21bb90c0-1a29-4cf3-b725-3d772e14fc3a/19193773146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcbd707-2d16-4b57-86ea-914b38c47562/tez_savunmasC4B1_sunumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52db9e9f-a520-4d8d-a79b-e4d39e5d7cdf/tewekug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb359a2-4048-4b71-93bf-b5d9cea443ad/nexudizawevuzuninubokirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f39d59-1ee1-4fc5-8703-1be14259ef1a/52573489440.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC618 4784 bytes
SHA-256: e216eb16bf1c8f40ed0813b6e98c09de4315d2d767817b90487045815088ae8c
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 9660 bytes
SHA-256: 546f6849c0f6ec3d289bedf4ae5bd55b8a940a5886ee03e3e96be8c304b9171c
font_02_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16168 bytes
SHA-256: 208743bdf3cc7a8a57817f7ac27e1b4abf7f4d36f593c9986615c5a5543e6963
font_03_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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