Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a19f4356e2135e4…

MALICIOUS

PDF

83.8 KB Created: 2021-05-18 21:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c8172a711647fc98b0892237ced67896 SHA-1: 5251081a0fa9e169bfb630cbe2f0186d76813fe6 SHA-256: 0a19f4356e2135e4723898d1762f594ffd61f35090b09040eb53f9f9537b5844
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and creation dates, but the primary threat appears to be the embedded URLs leading to external sites.

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://kuzutuzo.ru/strik?utm_term=ejemplos+de+estilo+directo+e+indirecto PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427105/normal_606bc1f6dafd1.pdfIn PDF document text
    • http://zupurowuzuxule.iblogger.org/dumom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_6014483f4bce5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_5fcbbf6e4a71a.pdfIn PDF document text
    • http://besuxiju.22web.org/aankhen_movie_hd_video_song.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/litimepubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371806/normal_5fdd22967678a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_605c2a96c6d67.pdfIn PDF document text
    • https://fubuvomaxafufil.weebly.com/uploads/1/3/1/6/131637814/5984a3def4b0c.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • http://pajabajo.rf.gd/burger_king_coupons_februar_2020.pdfIn PDF document text
    • http://resipivoxopir.rf.gd/table_of_contents_apa_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/92478063043.pdfIn PDF document text
    • http://womaxomud.rf.gd/what_animal_represents_adventurous.pdfIn PDF document text
    • http://defefefesid.rf.gd/are_harbor_breeze_fans_made_by_hunter.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/gefedalitiz.pdfIn PDF document text
    • http://vewemisesafi.epizy.com/cardio_gym_workout_plan_for_beginners.pdfIn PDF document text
    • http://durezalur.epizy.com/is_jocko_molk_good.pdfIn PDF document text
    • http://giratas.epizy.com/bridge_building_game_pc_free.pdfIn PDF document text
    • http://fasipubaweguguf.rf.gd/febojenatagewenagefediwe.pdfIn PDF document text
    • http://tuwemajufa.rf.gd/93637319407.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 1684 bytes
SHA-256: 4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 4832 bytes
SHA-256: b22a84c781f8659a038c7b8fceeb90e48441a3e0c638363b2ddd60f791579266
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 11692 bytes
SHA-256: f89f57967c9299560a87330f4f45f35211bf6411745cdf2f4bbf08c9b9062ceb
font_03_sfnt_off00013363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13363 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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