Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf5308c6dc91613…

MALICIOUS

PDF

72.0 KB Created: 2020-11-23 02:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a057a942a3e4d6c8404eb5802963751e SHA-1: b000522223a1de98f1a614316cfe37363597a198 SHA-256: 0cf5308c6dc9161398c03bd6e3bc44b8c4e0825c2ee08332de647a6a04cd91fc
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, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=cure+vampirism+skyrim+console PDF link annotation
    • https://wibujiwegawej.weebly.com/uploads/1/3/4/8/134899761/1251443.pdfIn PDF document text
    • https://xubupibef.weebly.com/uploads/1/3/4/7/134742940/wazoxafanegaja_zokativo_gitopu_zifugijosubol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5f98cd0f8c3de.pdfIn PDF document text
    • https://nowimadowa.weebly.com/uploads/1/3/4/7/134705132/7057540.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/wakiwekukominomemuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f8b6d6834f69.pdfIn PDF document text
    • https://kebakiwaranug.weebly.com/uploads/1/3/4/3/134317860/3208457.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://wawaxotev.weebly.com/uploads/1/3/4/3/134368025/e165fb.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/voxulija/hiv_testing_guidelines_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/rubefufifod.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/reporter_young_wrocaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e755924-221f-4902-a47d-3ebb5fe4b8cf/37559598862.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/63735037609.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/focus_online_free.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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 5208 bytes
SHA-256: 320d57736918b0d30b2a54dcfbf3b8eb8a706098fe4feea28c3046d896cc0a03
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10584 bytes
SHA-256: e477892388817190435b74cb4f81a40f825fe344754a2bdb3475d790e585cfb3

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