Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df4c25194cd03b3…

MALICIOUS

PDF

97.6 KB Created: 2021-03-22 18:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1067543bd41cd3dae235722b7456e36 SHA-1: 956612a0a28ea20aa0e9d5a839af9c538918fa2b SHA-256: 5df4c25194cd03b32d7341731bf1e4a62ed41e07d6e20582b5d1580f624624f6
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 0.9989

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://mezovuduw.ru/strik?utm_term=all+nonliving+things+in+an+ecosystem PDF link annotation
    • https://cdn.sqhk.co/lawikuto/jhZO5jd/79010971536.pdfIn PDF document text
    • https://wuviwozerax.weebly.com/uploads/1/3/4/2/134266003/0952455b8d1.pdfIn PDF document text
    • http://letgtma.bid/jujoganimobuletupebukipeujbmq.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/JrDJhgz/a_simple_model_of_motivation_does_not_include.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/chhota_bheem_wala_game_karna_haic71q7.pdfIn PDF document text
    • http://trenketo.buzz/earthquake_word_search_puzzle_answersukdlu.pdfIn PDF document text
    • http://swast-group.website/wenosir77a7.pdfIn PDF document text
    • https://dagaroxir.weebly.com/uploads/1/3/5/9/135973008/gilub_sexugawolufapex_revuziveba_dobifoni.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/jidjdjd/xowibalivijofima.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/hehejjv/party_city_balloons_halloween.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8a654d57-fa04-42e9-bc96-51a908613d64/76341102145.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_f11e4ada2da9414ca330b224bdaa845b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/375d85d1-2e4f-4f00-954e-4988883567ef/cycle_of_the_werewolf_art.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_7b0b9fabaaae4b91969bd416cdadbeec.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d227ff8331144d9b83db819141774d97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5009414-7ca1-4a4d-bf83-7bfc0132196f/all_american_pressure_cooker_parts_canada.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_a0e5b5848acb4e5e87d3ae2fa95e2b2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a85dc31-9ae3-4a4d-91db-c48fb556fee9/79590244216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2d7736-d396-4cb0-af39-8d548fcdb504/metro_2034_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddba182-d648-47a4-8bba-dbff37b87dec/java_an_introduction_to_problem_solving_and_programming_seventh_edition_by_walter_savitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7713fb-61bc-41b9-b07b-69dd0278b3c2/7116899171.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_fc15f24f0f514cae9ef3974c61d1571c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/978754cb-cf41-4dcc-9beb-891b11190ad0/why_is_my_electric_oven_not_heating_up.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 5056 bytes
SHA-256: 86b677039f3ef9bc305c717c779f077d3f79eb05fd6bb7feacd07eda6395ac8f
font_01_sfnt_off00014275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14275 11420 bytes
SHA-256: d3d1f79b1c4c70c4491fe8b6bfc74a2849774c2c57f34ae5524a7e92544dbc00
font_02_sfnt_off000168a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361