Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7302103d93a0218…

MALICIOUS

PDF

67.6 KB Created: 2021-03-17 20:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ca5d4201f07553752d1d66f13b2ef7c SHA-1: 1147fc93a416b4e2432b2350b4a873c81baffef3 SHA-256: a7302103d93a02183fd0a3ea96714b97fa8d14098e04b430c4119ea528ab2487
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=how+do+i+fix+my+dell+monitor+that+won%2527t+turn+on
    • http://kellys.space/ninja_saga_pet_guideo4ujj.pdf
    • https://cdn.sqhk.co/febutatesu/jdmKjip/98299491949.pdf
    • http://mangalvpodarok.ru/87164813782obbr7.pdf
    • http://nature-ital.space/how_to_make_star_sign_in_word97st3.pdf
    • https://dixoparogazasa.weebly.com/uploads/1/3/1/8/131871726/zebof.pdf
    • https://dokebama.weebly.com/uploads/1/3/2/6/132681336/zurileromedub.pdf
    • https://cdn.sqhk.co/pugepavofu/Bjgr7c2/11875454888.pdf
    • https://cdn.sqhk.co/jesupasuzoku/9oqzlwE/tap_tap_dash_juego_online.pdf
    • http://gumazesetijub.iblogger.org/maxi_cosi_mico_ap_isofix_instructions.pdf
    • http://rcasino.info/bizifobafopisorh5sj.pdf
    • http://tixarofisaru.22web.org/topugiwirilidudamo.pdf
    • https://kofekatemate.weebly.com/uploads/1/3/2/8/132815318/muxaratanafofav-fawerazo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad0dd353-ce72-4f17-8360-e20fab14715e/rivolibufimitiwaxatagu.pdf
    • http://gotugelimow.rf.gd/wedding_planner_contract_template_australia.pdf
    • http://setonan.rf.gd/csl_behring_gmbh_annual_report.pdf
    • https://uploads.strikinglycdn.com/files/e5a38fdf-15bf-4112-93d1-29609dab6935/24420316352.pdf
    • https://uploads.strikinglycdn.com/files/5335cea5-4133-48c5-861e-66b7f3c3e977/kirkland_hearing_aids_reviews_2018.pdf
    • http://zulegexexewunil.epizy.com/plate_tectonics_crossword_puzzle_answer_key_1-20.pdf
    • http://lisinawat.rf.gd/89772888260.pdf
    • 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_off0000cbf0.bin
80f06d5ef61cf4ada2dceff7843bc9a3be990a643421dd39e68d2da760f42adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 5224 bytes
font_01_sfnt_off0000dda9.bin
2c7c3ca46fdd6e4afd8b7c14c3337dfb10d8ee92098fe796cc92d5f6405b2217		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 10360 bytes

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