Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70851a27b9cc3ae…

MALICIOUS

PDF

78.2 KB Created: 2021-03-13 13:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39ad8dce30fa04046ba1a81b9cd11608 SHA-1: 9944fbbba1d2f2dae608e8f6dad264fc7f1579d2 SHA-256: d70851a27b9cc3aeaa7dd7d1f01712139578b7c98f031e6fbc0232037abb4a87
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://kuzutuzo.ru/aws?utm_term=black+and+decker+weed+eater+parts+gh3000 PDF link annotation
    • http://hiziryigit.online/30754493306upsu3.pdfIn PDF document text
    • http://winwites.space/txdot_form_130-u_instructionsl36lm.pdfIn PDF document text
    • http://stav-games.ru/video_er_for_instagram_repost_app_uptodownqwcfo.pdfIn PDF document text
    • http://spencermcman.us/howls_moving_castle_3rd_bookix7k0.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/ejeqsht/24792054044.pdfIn PDF document text
    • http://moreprodukti.com/why_maya_angelou_diedwhozb.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/iqRjbrB/jogigat.pdfIn PDF document text
    • http://usmileofficial.site/allegiant_movie_directorzzefi.pdfIn PDF document text
    • http://baltika-trans.ru/cursive_handwriting_worksheets_ks1o6xgt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_d6e237c2c6e4455ab9afa5360edb5000.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_58e1a433e3b247adae13353dec7cb4d0.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_97c9948e18974aeebaa2a999038bb356.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a38799-8cd1-4c45-b1ff-e18b794db416/24173983393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58372ff1-dd57-421a-8279-984f46f945ff/musepedixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8067121e-c655-41c3-9b8d-5cbce3da0401/56905587532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b4c97a-8a77-499f-8403-7565af89f6a0/what_can_cricut_expression_2_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c961414-95d1-4020-94fb-df4619a4085e/data_communication_and_networking_forouzan_5th_edition_chapter_11_ppt.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 5844 bytes
SHA-256: 14f28cae75877b2bdf03eb5a49b8cc248554e4b6870d1d41612520e568ebc38d
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10720 bytes
SHA-256: 8f0bde26b075a4a8fa32019634393eaef32e20515f6c154d50de33d47f5a3afa

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