Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9e156b4d426e49…

MALICIOUS

PDF

59.9 KB Created: 2020-11-10 08:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 759f871ddb5d708011decd13601fe032 SHA-1: 2dda9355f2304e428fbac4ffcb251458b91d945e SHA-256: ff9e156b4d426e496a91cddd40b9e7734976359f7cc632a4acdef8332c36b4b2
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 0.9995

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://trafficel.ru/123?keyword=imf+worksheet+answers PDF link annotation
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/6773697.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/zugawubew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5f9c662d6caa4.pdfIn PDF document text
    • https://dewufixibofapez.weebly.com/uploads/1/3/4/5/134596153/1143683.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/zuguwadab_diredofajo_sobijemu_gagefefotovar.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/1ce96c12-4b0f-406f-812a-9ed978d8135d/65994331853.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/starfinder_armory_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f06438-98fd-4bd4-a4b5-ae53ba469fec/nawovawib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ef3f8c-05ee-418d-a7e0-7a0cdfceacae/bokupeferowugoburuserusif.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/vexasasalopuvanep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322b4e8b-febd-493b-87a8-02ad5993c2a6/41266993497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49029486-9a94-4fc6-8b22-410fabad9dea/28094538389.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_off0000b0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 5068 bytes
SHA-256: 1c8f96ec39a5fb9719cbe7f8c5f2e276be617f2eba39ed35f0dd486b7d5bf99d
font_01_sfnt_off0000c215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC215 9600 bytes
SHA-256: 74568bb85274916f1d8267d9f6a36f645819f3ede552aa2a5c9691e70afaeef4

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