Malicious PDF — malware analysis report

Static analysis result for SHA-256 37161107f2515eca…

MALICIOUS

PDF

76.8 KB Created: 2021-03-11 13:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45de319d2a483e52cb271e4bca6df37f SHA-1: b0ca3e597a80c02efc060a38ce96d3f4b785a6ee SHA-256: 37161107f2515ecac01bd8c586e11f5c47c7d1b6e9233a6dc77e16f0add74363
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the primary URLs extracted is https://golowaki.ru/aws?utm_term=our+final+invention+chapter+summary. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific content or intent beyond its function as a link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://golowaki.ru/aws?utm_term=our+final+invention+chapter+summary
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/f8c736b6.pdf
    • http://gigezesuzobe.getenjoyment.net/nevanotizofofa.pdf
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/9003970.pdf
    • http://japancar-sib.ru/best_board_game_to_play_online_with_friendsmbdcu.pdf
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/c414ce.pdf
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/d275f2d7.pdf
    • http://bilkan.fun/how_to_use_an_ipod_nano_7th_generationm5cnq.pdf
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/mejoliladojum_jubofemibuju_fabadutekizako_wakedapaluwixis.pdf
    • http://good-production16.site/black_and_decker_air_fry_digital_4_slice_toaster_oven4ike8.pdf
    • http://kutatit.getenjoyment.net/zitamipi.pdf
    • http://fazejajogavu.medianewsonline.com/kukasarolasivibenexovelun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_ffc01886636c42ce961703e4a01d6635.pdf?index=true
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_9850c2277b0d4fd38c6e1e969831dabe.pdf?index=true
    • http://lapetagalelan.myartsonline.com/gevenidajepi.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_db04a549dadf48ec86677260ebc0890e.pdf?index=true
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_53e4cb5d87f24e1ea3d7179baeede278.pdf?index=true
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_c4bf050a00284431aaa814af71ebbf53.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_633a17a86fc1477baf1700178978c655.pdf?index=true
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_91425098302741fcb666eb51af97fb91.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ea6528f82e824c2d94e0897a32c1c489.pdf?index=true
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_0cce3e17a1fb4de0a1ee472fad326230.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_off0000f031.bin
1334a57cd3f50fd4f3f225d30e4ed5760f082119faf7ce5f387cbd6048c8a2c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 5444 bytes
font_01_sfnt_off0001029a.bin
1f5441aa511b416d50248518cfcf28f6c209f07fc6aa95d99340f47f26db2ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10328 bytes

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