Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7941cd1cae3070…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 05:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e060c1fa898506e1c9291d72cf6ca8a8 SHA-1: 998f2d570ee4ebad2fa6a02590fd2c3749b73581 SHA-256: 9c7941cd1cae3070c10d297145dec4a09a20998d8a9aa937339446cb4984f8ac
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's primary purpose is to drive traffic to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=shakespearean+insults+dictionary
    • https://cdn.sqhk.co/kanemili/yihpNgd/ara_pacis_artista.pdf
    • https://static.s123-cdn-static.com/uploads/4454302/normal_60089e81d4fcd.pdf
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5fccff3e95d12.pdf
    • http://table-wait.com/19657058874c5ks1.pdf
    • http://blog-millionaire.buzz/to_the_sky_kingdomhzi9l.pdf
    • https://cdn.sqhk.co/nivopekodi/EPjagjZ/brand_management_certification.pdf
    • https://cdn-cms.f-static.net/uploads/4530457/normal_605dbf98cfce0.pdf
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fe30fb1e8c64.pdf
    • https://cdn.sqhk.co/sevafeluba/zicMjjh/claw_game_toy_story.pdf
    • http://topcreditscore.info/japanese_restaurant_menu_templatevl2or.pdf
    • https://cdn.sqhk.co/pabelewexo/jc48agh/northern_renaissance_definition_world_history.pdf
    • https://static.s123-cdn-static.com/uploads/4414342/normal_5fff00a477451.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_cf71c9b7c2074bbb9372b8cc79581a01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2fe78b65-a92e-4261-9f79-3732b88062d4/my_life_next_door_book_series.pdf
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_39be87385e9743ae920b14ae3c094f17.pdf?index=true
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_20be678269d6436894edef3dc662188a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/79d376dc-0dda-49eb-834a-86e4188d757b/which_one_is_an_example_of_a_conceptual_model_in_science.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_be96ed3dcef14bb48f5669a023f2ff2e.pdf?index=true
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_05a8e8eefa2544a3ac8536344bc0602d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc37194e-c7eb-4f07-bacf-04024643874e/15854830990.pdf
    • https://uploads.strikinglycdn.com/files/a1dfd479-498d-456b-b47c-596eb83e0b90/49825083550.pdf
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_47bd1deca5574a1e9333cd0784d88a46.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd5.bin
f98fbc58e82a9bf91acdc938a174fcef2c4920152518fe964d917f722215cd1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5432 bytes
font_01_sfnt_off0001024d.bin
7686532270482e59a30011d13a080554141fccf0f5dc7d5611d826f6f07af7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 11276 bytes

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