Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcd0be48f170d51…

MALICIOUS

PDF

79.5 KB Created: 2021-04-16 10:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3e52d3b51168d919e30fab7fe901dc SHA-1: 6aa29655010602063f50a9e14fbb1e53b22d6d79 SHA-256: 6fcd0be48f170d5106d23d6a8d61ae45707dc91342e124986bd823b2161a6a94
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to car decals, which is likely a pretext to drive users to the linked URLs. These URLs are likely used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-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://dafemum.ru/strik?utm_term=how+to+remove+vinyl+decals+from+car+paint
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/86febfe5182.pdf
    • http://meinekarten.best/aprender_ingles_facil_y_rapido_leccion_151b7m.pdf
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/a629e8940a7.pdf
    • http://uaregroup.com/guided_day_tours_from_rome_to_veniceqtjs4.pdf
    • http://fegoxedivex.iblogger.org/chrome_apk_for_android_4._4_2.pdf
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/0b33b1313d2dc0.pdf
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/nizemow.pdf
    • http://nilozususa.iblogger.org/how_to_measure_effectiveness_in_healthcare.pdf
    • http://profibrend.ru/92814538432kybf3.pdf
    • http://betixisu.22web.org/discombobulate_sheet_music_piano.pdf
    • http://vatamulejuvovi.22web.org/badminton_england_rules.pdf
    • http://pemirok.22web.org/belly_full_movie_free.pdf
    • http://bestrongbyg.com/rexoxizupabunigatiwonit66qkb.pdf
    • http://g00y.xyz/wikipedia_voice_readerzbmne.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_75cc038d570043dfa9cf033e70ac52d2.pdf?index=true
    • http://rodobokojezaga.epizy.com/63755572189.pdf
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_c67f661436094ae9b96876a72d14882b.pdf?index=true
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_8b374c8db3804de292b862ae02a29f9e.pdf?index=true
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_6d349f49c988403cb9938529caeb4c97.pdf?index=true
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_b6ba011e4e1649219cfc146808f55416.pdf?index=true
    • http://gifesikubelazu.epizy.com/for_game_loop.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_11ad3d6814d9451e96391d5ffb376533.pdf?index=true
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_b46b89c9be3c43aa9a3decd5ac5539f7.pdf?index=true
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_9f4ca33a5e9f4c4e8f49b88e991847b0.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_off0000f8bb.bin
418237dd4571e5b7b54ebe04616af594761a7f5611bc3f467c90a0e46ed1cbbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 5516 bytes
font_01_sfnt_off00010b80.bin
10284586d3e6e0cb67bc589b1a8f3458ebcae97eb564faee5b26963d345ebb71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 11064 bytes

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