Malicious PDF — malware analysis report

Static analysis result for SHA-256 e081c7bf3f715b26…

MALICIOUS

PDF

71.1 KB Created: 2020-11-21 22:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fa93c4884231ebf59c392f9ff155a833 SHA-1: 920171fd77e6787ac3bb8055e25cfca29fcfc930 SHA-256: e081c7bf3f715b268b6cfa1a428d7c108d2d9aa8e53804688f9f0e5fbcfabd36
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://traffine.ru/123?utm_term=cpm+algebra+answers+chapter+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485813/normal_5fae8e1855857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fb7aea417d15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f967377d89fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5f9872ceaaa27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5fae994aaa6f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5fa8d2d3397ba.pdfIn PDF document text
    • https://lodufowuk.weebly.com/uploads/1/3/4/5/134593986/5027864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f9daa7e2a03c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f97f95491e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_5fa4ba84ba850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f975f208fcbb.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://s3.amazonaws.com/donake/kidaralikiwiviv.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/garant_snow_shovel_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/alexithymia_treatment.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_off0000c761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC761 5356 bytes
SHA-256: 677b669385b20593febd499ce734a443a63f096de97a920680ffc199db8d9378
font_01_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 12000 bytes
SHA-256: 6442136b3d38d9681a9129edb1ba2fbb08332fa862745d67df32e4e0d2b9f76b
font_02_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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