Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b64cd372453c30e…

MALICIOUS

PDF

78.9 KB Created: 2021-04-23 22:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9ea0bd26f330b2d655b56e5e84dbbd91 SHA-1: d6ea16c20b88ea4a15f33cf94edcb52d3906904d SHA-256: 1b64cd372453c30e9922b63901e517d3ebc47ecb58da41b63c842b7bdaaa6bca
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://pelibifir.ru/strik?utm_term=pirates+of+the+caribbean+will+there+be+another PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420934/normal_605f52e810a17.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/3623256.pdfIn PDF document text
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/4916159.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/ogh3wlf/splendor_board_game_rules_nobles.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/bzjdlgj/dagilenibe.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/OpihijV/30095820437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_60655d43cd118.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/ginur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_606772f189738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_60011f0aaf007.pdfIn PDF document text
    • http://brumbum6.xyz/harry_potter_8_movie_box_set16j85.pdfIn PDF document text
    • http://submonster.xyz/food_to_eat_when_u_have_eczema68y0v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_6061e68a3456f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_6046dc1b4939e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_6016ab8f10a46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_81992e44ec284248a77841a12571c2fb.pdf?index=trueIn PDF document text
    • https://ff5d1526-1eb9-447d-8915-67ca9933f1b4.filesusr.com/ugd/9565fd_5f0fb28b57394a51bd1a0954a546631a.pdf?index=trueIn PDF document text
    • https://b7b9a0d4-d71d-433a-9dbc-8293b1c729aa.filesusr.com/ugd/979434_8bd34bd3d06545edb5ac6eda10301450.pdf?index=trueIn 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_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5200 bytes
SHA-256: fc58cca0ae0ea9baef3da4f72b7a7b960b3230f252178e7701408d0f7678c805
font_01_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 10680 bytes
SHA-256: c26add60ed231d11c4f47488881e748a71f82633018194ec650e5064c553a762

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