Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c25eacccec66894…

MALICIOUS

PDF

72.0 KB Created: 2020-11-28 01:37:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 68be80fe51e0caffd71cb4917ecc765a SHA-1: 2a533e2d5de408b1f51ade452f061df7f7296337 SHA-256: 4c25eacccec66894984f644b31b61e873fe2ae20ae3dc0f4e74a23f597cba092
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/strik?utm_term=bankchain+is+an+example+of PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5fbf1e5c00efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5fa5a499351ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f9f446fd9f47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f87039b32c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_5fb7abaed11a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5fb25e13e42c4.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/7b95fb8.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/6292142.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/df808348-d91a-4a50-ac3c-3021670995ba/456038682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3e9c03-9e9e-40b9-b900-7483087e7902/gelosevewemulun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58aeba9c-d886-4a43-95ef-56f4fd5d19bd/casita_rv_trailers_floor_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fb5428-acea-46de-a75b-75f427ad804e/mabelavibisurenatu.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_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 5048 bytes
SHA-256: bacb9d6c1ef55075492eb5b0ec9c7e020e425a6acafa2754a9c500501c8fda8f
font_01_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 9892 bytes
SHA-256: 71b606bb2c19e8d5aeb824405a3d7b9fcfe2d6c3606b568e9b62afc1324fc414
font_02_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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