Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81e9dad29ab8f8d…

MALICIOUS

PDF

77.9 KB Created: 2021-03-18 09:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ba6218e8f4e9ea4bd3a8812f7ddf6e0 SHA-1: 73e2f340dce2110d5fb217177105d0c3219304f7 SHA-256: d81e9dad29ab8f8d52490f16ca3a32c70b722767774b2c900518758c868751c7
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a high number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body text is garbled, but the presence of 'Braun silk epil 9 user manual' indicates a potential lure to trick users into clicking malicious links.

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://nipisod.ru/123?utm_term=braun+silk+epil+9+user+manual
    • http://rajukeno.22web.org/what_is_the_overview_of_a_book_called.pdf
    • http://nufapivevavenak.22web.org/10516078105.pdf
    • http://wavepolabipal.22web.org/anytone_at-5888uv_iii_review.pdf
    • http://help-igcopyright.xyz/standard_wire_gauge_current_ratingfnve6.pdf
    • http://durebemidiges.getenjoyment.net/fajokekakoboxifopabirubul.pdf
    • http://bavimobuxadu.medianewsonline.com/simomerobazinawaretoxote.pdf
    • https://cdn.sqhk.co/noperizapewo/etjcYtE/97._3_the_wolf_listen_live.pdf
    • http://ritegifufefut.scienceontheweb.net/romebemereruxomusamafu.pdf
    • http://tk-time.site/will_chrome_continue_to_support_flashdeaqz.pdf
    • https://cdn.sqhk.co/tewokozogop/D9shjEm/bikepab.pdf
    • http://abanca-electronica.com/441015792384d556.pdf
    • http://xibevajisigidig.22web.org/89874321910.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gukutimaguvuzum.onlinewebshop.net/browns_2020_schedule.pdf
    • https://s3.amazonaws.com/womirofop/international_business_machines_corporation_annual_report_2018.pdf
    • https://s3.amazonaws.com/zabevog/xutukideki.pdf
    • http://kegigija.atwebpages.com/vox_vt20x_amp_review.pdf
    • http://furiroj.rf.gd/the_bell_jar_summary_chapter_3.pdf
    • https://s3.amazonaws.com/topipovikapari/how_much_does_it_cost_to_install_a_culvert.pdf
    • http://torejejowomu.myartsonline.com/joxezixiwizazogo.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_off0000f0e0.bin
f8882e190a43b01e865821eab4b0766d4f57de8f46cb2ef959fd33ea2b5d9594		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 5236 bytes
font_01_sfnt_off00010292.bin
7f9ed74fceae1fa4c87b9f5f217588a8979172fa128ce6f6a33f61932e57effb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 11340 bytes

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