Malicious PDF — malware analysis report

Static analysis result for SHA-256 979a1255beb2d08d…

MALICIOUS

PDF

78.9 KB Created: 2021-01-14 06:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 93e5376ed2e6c939d14c19f698f8f6fe SHA-1: ab7f1747f873218d971d20ce733dd419868f95a9 SHA-256: 979a1255beb2d08de9d5b8eeaca0498df60ee5c02f9618742a3882a97d1f9003
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=booklet+document+template PDF link annotation
    • https://cdn.sqhk.co/vexedobasof/hehhHCQ/38504156815.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/igf1fji/dragon_world_full_movie_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fa777e77e28e.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/13302662194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5ff171433cc29.pdfIn PDF document text
    • https://site-1245151.mozfiles.com/files/1245151/not_answering_the_phone_at_work.pdfIn PDF document text
    • https://soxagunolipug.weebly.com/uploads/1/3/4/8/134887217/943258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_5fe7216c32770.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/suxodakowe-sarewajer-xefebijokupagud.pdfIn PDF document text
    • https://site-1166595.mozfiles.com/files/1166595/netavipubawedimilajek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5fccc0c694963.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/aheklIV/91354339539.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/YjcggYC/23199238076.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/ed4gjie/xikavanogulomojof.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 4892 bytes
SHA-256: 48b71d1f1aef4d79c46efe3a57964e077c7f81c03116167b99b533a574399d2f
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 9972 bytes
SHA-256: 42d641e0c0a54696654c47da3898b6cb80a314b11fc7c0857bfee37dc2938689
font_03_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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