Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb042712bc8967d9…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 08:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: faa87e581373e425c5acaa721019dad8 SHA-1: bd0bd0b2c71da93dae4c4f40a66711acd3c31c7c SHA-256: fb042712bc8967d97a4a0ed0b27af79884af2d5b69a27809366f3acd9e64012b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://gimoguvi.ru/strik?utm_term=midnight+sun+review PDF link annotation
    • http://gasokab.iblogger.org/casting_crowns_only_jesus_album.pdfIn PDF document text
    • http://timinome.getenjoyment.net/why_is_my_honda_lawn_mower_not_starting.pdfIn PDF document text
    • http://lemopebese.66ghz.com/94009794082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/rca_rs2664_5-disc_cd_changer_bookshelf_audio_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66a8a81-f02b-4598-9eda-936b16ecd514/78523070032.pdfIn PDF document text
    • http://feferabi.atwebpages.com/how_to_change_address_book_depository.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c2e1e1-01a1-41a7-8f6f-0c12f438c575/71147561322.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_7e8636dd929c4ef89eb646f4e363fe47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f05ba1-5099-489e-b8fe-4857175c180d/30314896438.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/wemif.pdfIn PDF document text
    • http://birevave.rf.gd/24561311701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d37a87-473c-412d-a3b9-3841803d5752/survival_movies_netflix_2020.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_b83342e496914c8f9a8c75d41e13ef80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51cfb089-b302-4033-9c66-313d7c739238/english_102_vs_103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38df5c96-b964-479d-a7ab-8198bff6427d/44494743516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9e776c-d08e-45d9-ad84-deb73ed32700/dd_3.5_underdark_races.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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 5000 bytes
SHA-256: 71c3a1c3c0866ef391d9da82762ee33137e7037661a8db8e9aa4b1ffeefd07f4
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 10856 bytes
SHA-256: 95c6c71e157c913086f7c4831d6359e50e78bdc8ba6e9930744d4dfa9e574193

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