Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86441bfa64dd9aa…

MALICIOUS

PDF

71.5 KB Created: 2021-03-10 14:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a93d01ca08a7fe25ca6def5e108b8b7b SHA-1: 1182cf7ba69f87852e32f7d58c4688cf0e380fa4 SHA-256: e86441bfa64dd9aacb39a8a35db316052c9955e0c650861c2eb0ebe1d208bba8
186 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=abc+rental+wausau+reviews PDF link annotation
    • http://alkostore.xyz/autodesk_bim_360_glue_desktop_appwoms6.pdfIn PDF document text
    • https://bazigumaxofiz.weebly.com/uploads/1/3/5/3/135383162/dewije.pdfIn PDF document text
    • http://mini-camera-super.club/60733875184h5d7g.pdfIn PDF document text
    • https://juwememuju.weebly.com/uploads/1/3/4/5/134523402/4026380.pdfIn PDF document text
    • http://verification-help.com/jagonipegup90qd.pdfIn PDF document text
    • http://azules.ru/63476733770h6t1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc50daa7-6c8e-4d44-964a-f955de708431/reported_missing_season_2_episode_2.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_c30d0ea53da749149f7bdf6d4d06115d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e39db6-7973-4c54-bea5-e14c193ad5bd/starfinder_near_space_free.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/zonajewof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d57b48e-2297-4178-96c2-0e820afcf048/the_possibility_of_evil_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b17ea5-b780-417a-ac60-ae7254953a2b/how_to_charge_portable_jump_starter.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/the_master_book_of_candle_burning_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/zuvuse.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/conjunctions_board_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e10f76-fa2c-44f6-b4d2-459db3b96df9/27954525492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f1b11d-14bc-4d21-bbb7-3cf6df282a21/corsair_k95_rgb_platinum_custom_profiles.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/robifakaminofegamiji.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_35bc9452f05c43968d0dca99e4f21e82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17cd1af-5cd2-4d67-bddb-863d46730a90/what_is_fresh_off_the_boat_mean.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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 5076 bytes
SHA-256: 6685756fb2748fddd29a85fe555df3127e38b7e394a0d4ba867ef8ae021bf769
font_01_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 10412 bytes
SHA-256: 5d2298e8093b503e619383cc982eec3c00978e10ff3af9927abc977c6d48ef50