Malicious PDF — malware analysis report

Static analysis result for SHA-256 3620f6ebd1ba3ffe…

MALICIOUS

PDF

76.6 KB Created: 2021-03-23 13:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63b9c90fb7ec517415fd851b2c07da6e SHA-1: 9bc6cd9b7acbea3dbb2661274e27d5832473d03b SHA-256: 3620f6ebd1ba3ffed33aa04e70583a2a8a4c8fe86d1141befcb0c2efc2eab55a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to a site that appears to be a link farm or redirector, disguised with search terms. The document body, though heavily obfuscated, contains remnants of search terms, reinforcing the lure. No scripts were extracted, but the presence of external URIs and the ML detection strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jumiwimov.ru/strik?utm_term=troy+bilt+riding+lawn+mower+for+sale+near+me
    • http://fruitslope.online/jacques_vert_dress_size_guide754ya.pdf
    • http://good-production20.site/zumupipovibipisorasebof5cy92.pdf
    • http://oneplusonemain.xyz/what_to_get_my_boss_for_her_40th_birthdaysy107.pdf
    • http://itfamily.pro/black_and_decker_mega_mouse_sander_instructionsv0h1s.pdf
    • http://businesshelpservice.com/pobafixufizeo6w75.pdf
    • http://gapewikegolunop.iblogger.org/79080220153.pdf
    • https://cdn.sqhk.co/zolokike/jhhgjdW/viwojipamewepisi.pdf
    • http://beguwidip.scienceontheweb.net/lural.pdf
    • https://cdn.sqhk.co/kovixileta/ibiiljb/puvuzizetirenunudevujumog.pdf
    • http://duvejajenivogik.getenjoyment.net/1217171726.pdf
    • http://limigulel.iblogger.org/21944368452.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/widuxade/how_much_does_lotus_car_cost.pdf
    • http://vijanemafe.rf.gd/activate_windows_8._1_pro_32_bit.pdf
    • https://s3.amazonaws.com/doxifuba/amplified_bible_classic_edition.pdf
    • http://nudobovedazopor.epizy.com/traditional_vietnamese_dance_videos.pdf
    • http://zoletafexogixa.epizy.com/scatter_plot_worksheet_2_answer_key.pdf
    • https://s3.amazonaws.com/sivanira/biology_diffusion_and_osmosis_worksheet_answers.pdf
    • https://s3.amazonaws.com/bupaxomu/el_capital_karl_marx_tomo_1_vol_1.pdf
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_1044d62f2ff64aabb0c7d93eb3bf81bc.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_0c7b16ff06b84dcebed1d0ca804defff.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_5042aee3efbf45a1af5fd73ed4f78ccf.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_off0000edc1.bin
8bcc5b3f165ae7d587ff8b2949dba0b334f7f9a4ad07b0eec275f4452658cc25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 5508 bytes
font_01_sfnt_off00010082.bin
a8972141be2d66f8ef75c0de6da16d42d0e31a8828099ee206b7570321a0cb7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10596 bytes

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