Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a48959139f07d3…

MALICIOUS

PDF

59.7 KB Created: 2020-12-15 09:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 72ec54162b5cb895ad33f043c2396f86 SHA-1: e3387ec07e2677458dc97881292d3867899e6f7c SHA-256: d6a48959139f07d3e9c2bb49cd3ccc345f237665a604299205f8e1396e3d75d7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://traffine.ru/strik?utm_term=dish+receiver+setup'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the overall detection profile point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/strik?utm_term=dish+receiver+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5fb959103fb5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fb7b9580aff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fa3ac97b2538.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/bamedisujenafo.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.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/17a53477-43a1-48d6-9066-6791978c7d9a/59860546820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ad1ce1-a17d-4d0c-9d14-821e612c58dc/osrs_dagannoth_rex_slayer.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/cezar_roberto_bitencourt_tratado_de_direito_penal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f73d9ec-e054-44df-b125-32945aa5a094/triple_integral_convert_to_cylindrical_coordinates_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207c737b-37fb-48db-ad3b-4bad68ed6787/rca_universal_remote_automatic_code_finder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcea2a91-0d2f-4f8b-a0ad-be257fa07584/lixapekukor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b973717a0f60c4053b44/t/5fc889caf97c193540f2d5c2/1606977994578/canvas_parent_sign_up.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_off0000b0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AC 4840 bytes
SHA-256: 628ef0de98905e8fdb622c212d488cd8aa893806e9a1490c5141766ad7ec9e76
font_01_sfnt_off0000c130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC130 9672 bytes
SHA-256: a27e7df52d3219fb3e4d8c32aead3ba9f48d8496297182355c591fadceefb086

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