Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a398e1f3a2883a8…

MALICIOUS

PDF

79.1 KB Created: 2020-11-13 14:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e745ce54ac32801f6242300fa6f39d86 SHA-1: 2d498aae05de4b5eb0c755097f4fba88bfdf8342 SHA-256: 4a398e1f3a2883a8e722406f61be600750a19cf44d5f5c331b838e282e8d156c
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 0.9998

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://trafffe.ru/strik?utm_term=the+simpsons+road+rage+pc+game+download PDF link annotation
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/2082326.pdfIn PDF document text
    • https://lutenowunag.weebly.com/uploads/1/3/4/6/134627800/d3b09.pdfIn PDF document text
    • https://tibulewozimok.weebly.com/uploads/1/3/4/0/134017320/mizafawobadulal_jatijepuzibemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_5f967448c7c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_5f9b7006cfb02.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/0f11c61ea3fc870.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/6acbcd22-7415-4241-bacf-21f0b42547b6/36001037702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f43324e-7796-4f1b-855e-1448f3e95cb8/rinirikimelufoxekagozole.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/aaromale_female_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c677f96d-83af-41d1-a1e6-3a98328831c4/jeff_dunham_s_wife_s_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1e36ef-70a5-4068-9dc1-dbd48e584cdc/tunomopobufalibesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6df7ea-d6d5-4c52-875e-f3775d6f6025/pnl_para_nios_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee63fb9-461b-4f39-b167-ba402323f5ea/52121482070.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_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 5528 bytes
SHA-256: 459228aabeb9b20658c5c7026a69bc4113b6ff9d011be412ad5bb5ba11aa662e
font_01_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10640 bytes
SHA-256: abb69644e7cef56bfc83776125700c2a031125d8cdd8ea1007dfaccc82805581

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