Malicious PDF — malware analysis report

Static analysis result for SHA-256 30446750dcb8f5ce…

MALICIOUS

PDF

78.1 KB Created: 2020-12-27 20:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 13ff77d19f9e6f654cfb0f02980cefaa SHA-1: 0b23a38ae724fba00d9773b5ff2cf70fba9866b6 SHA-256: 30446750dcb8f5cea726d245f1f050f8011f06f5f2f06c669556032ca914c53e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffking.ru/strik?utm_term=potion+explosion+2nd+edition+deutsch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458826/normal_5fa6b1de0a4d6.pdfIn PDF document text
    • https://vukekitap.weebly.com/uploads/1/3/1/4/131438073/5884349.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://nerefowat.weebly.com/uploads/1/3/4/8/134856831/282974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f87c5f0b7dd7.pdfIn PDF document text
    • https://kamidosebesu.weebly.com/uploads/1/3/4/5/134593467/2338823.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/gapalazef_guwafapigefep_newome_zibarer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jikopot/rikizifagiwizopaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/76185510546.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/70282056742.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/aoristo_griego.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/pocket_cardiology_sabatine.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_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 5056 bytes
SHA-256: dcc18bea1579eadfd2781d828c16b56de16f005a04759baa7fb83867d15afc05
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 10856 bytes
SHA-256: 3a2c82cca15aca732a1b3d38c33bd06fe4f8a6bce3b68b0d4c6f66e7519d7e91

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