Malicious PDF — malware analysis report

Static analysis result for SHA-256 9719893117c7d986…

MALICIOUS

PDF

63.7 KB Created: 2020-11-26 03:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ed601a617fbe2f3ddea3bcb26f8f9806 SHA-1: ddf645dc6e681545f2e78abad19a66ba2a7664db SHA-256: 9719893117c7d98653c0f949c22a7db056e08f315fc14f4e8d840fa4e4d37ccc
186 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 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://traffine.ru/123?utm_term=excel+2010+training+manual+pdf PDF link annotation
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.pdfIn PDF document text
    • https://vinatisuxuzelo.weebly.com/uploads/1/3/4/7/134770563/c160122cba.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/totifulujexozixa.pdfIn PDF document text
    • https://xowedoditigivi.weebly.com/uploads/1/3/4/7/134714126/8797139.pdfIn PDF document text
    • https://nubagusajol.weebly.com/uploads/1/3/4/2/134235051/waviraboro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5fb2ca65f1582.pdfIn PDF document text
    • https://sidunaxegizu.weebly.com/uploads/1/3/0/7/130776644/gudote_kukebozowomobeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f86f4c459056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_5fb8c75f48ee4.pdfIn PDF document text
    • https://roxexiku.weebly.com/uploads/1/3/4/4/134445291/tenoraf.pdfIn PDF document text
    • https://www.manualsearcher.com/micIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/pokemon_game_sun_and_moon_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155b9c67-4dbc-467f-8b43-98fd10f84e3c/24042670423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e25f835-66c5-4a39-b2f7-3850c23689fc/wemmbo_bit_heroes.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_off0000ba9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9D 5648 bytes
SHA-256: 38593cc7885eba0e2632f623440aede5ab0fc4ab381c9c9aa49657c7df078bc0
font_01_sfnt_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 10428 bytes
SHA-256: 35f29055bb619d733ca449b96bf930d0382cc301909e06f2bf5099bd90925d3d

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