Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cf3977bc7f20ec…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 07:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b44a50ee74b2ce0a430b5ab286de9e6e SHA-1: df22a8a40f79875ee97a7b422d9fbefedb84f4a7 SHA-256: c3cf3977bc7f20ecf2d373b9fec2fbeec906f58b6ee1fd9a3771cfbef06408d2
166 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URLs on disposable domains, with one notable URL being http://lnstagram-help-businesss.com/harry_potter_butterbeer_recipe_starbucks48y2l.pdf. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_PASSWORD_ARCHIVE_LURE heuristics suggests a tactic to obscure malicious links or content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=pencil+calligraphy+worksheets+free
    • http://lnstagram-help-businesss.com/harry_potter_butterbeer_recipe_starbucks48y2l.pdf
    • http://vedice.ru/yamaha_moxf8_88-key_synthesizer_workstation_guitar_center1dyml.pdf
    • http://milesnires.xyz/mr_pumpkin_2_walls_of_kowloon13zap.pdf
    • http://drive4mclanemilwaukee.com/martin_luther_king_jr_speech_video_fullmz83u.pdf
    • http://marketitaly.info/kaxoxidebodqh8p.pdf
    • http://betmoy54.com/45128904303fss7u.pdf
    • http://zelumefepa.sportsontheweb.net/fantastic_four_movie_download_in_tamil_isaimini.pdf
    • http://ezfix.asia/rudovaxuwoxefjges6.pdf
    • http://fc-aromat.ru/240730118198syp0.pdf
    • http://goproits.com/erc_starting_grant_template_2019sleln.pdf
    • http://mkr-olimp.info/how_do_i_reset_my_heating_padi97kr.pdf
    • http://sobakin.space/palliative_care_guidelines_nicecuzuy.pdf
    • http://my-favshope.online/what_are_the_basic_questions_asked_in_finance_interview3rewa.pdf
    • http://kindraretterath.com/rivers_of_blood_speech_videogysc2.pdf
    • http://idealica-ufficiale.site/american_assassin_film_review_guardianp2w32.pdf
    • http://fresh-ita.fun/lic_-_life_insurance_corporation_of_india_mysore_karnataka7m03j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_1ac3b54301fc4dbeb653d8e4a0e9fd25.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_ef52689f125a486ea125ab11fd0d05fd.pdf?index=true
    • http://xujided.onlinewebshop.net/88202439595.pdf
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_374edae5b5d44722a318af2796e592f3.pdf?index=true
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_189f946ee56a41578f5681795d34f796.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_off0000ee11.bin
2437edb642ece7e42a31f3157ff2e190e5e8c1f1784624858deb8099dff3137c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 5536 bytes
font_01_sfnt_off000100fd.bin
afa48d2cd6c9aba8da2f1e09080dbfeb4ff96a60f38b58432f71d5b036faef3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 11740 bytes

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