Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8ef3ec0c8363bd…

MALICIOUS

PDF

74.6 KB Created: 2021-03-12 09:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e30b0976659a4b273d108694b59a7701 SHA-1: e1fde06370359e18ed9aeb380196badaf9ccdb64 SHA-256: 7c8ef3ec0c8363bd23014cd8de59e016ec8604a2d88757a42ecfbe06c415571a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a "PDF link farm" pointing to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URL and the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+is+sag+ultra+low+budget
    • https://cdn.sqhk.co/dilizilozok/ECheYii/temple_run_game_download_jio_phone_app.pdf
    • https://cdn.sqhk.co/sobexofap/ZUUibhg/asphalt_8_hack_without_root.pdf
    • https://cdn.sqhk.co/mavozopofug/cheOaZu/day_r_premium_mod_1._670.pdf
    • https://cdn.sqhk.co/kogewole/hejfT00/zofufez.pdf
    • https://zoximubovug.weebly.com/uploads/1/3/1/3/131379564/xobekumuzizuwim.pdf
    • https://cdn.sqhk.co/runudori/Uigjcib/auto_reply_message_sample_for_sick_leave.pdf
    • http://whitecheat.xyz/presonus_audiobox_review840xu.pdf
    • http://connexion-amelii.xyz/41738095757ivh8q.pdf
    • http://naturalgood.space/faxagezurimokilikaruivmrq.pdf
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/jexowilew_nujumavazam.pdf
    • http://form-lnstagramcopyrightservice.com/foundation_standard_4_employability_skills_worksheet_answersswf2p.pdf
    • https://cdn.sqhk.co/fivuwunar/lhg7Pgi/sun_tzu_art_of_war_business_strategy.pdf
    • http://sport-stavki.fun/where_are_my_hidden_pictures_on_iphonehk0wt.pdf
    • https://cdn.sqhk.co/zewumabigige/hbhaFia/c_compiler_identification_is_unknown_ubuntu.pdf
    • https://kikokowenut.weebly.com/uploads/1/3/4/7/134713101/9516235.pdf
    • https://lebuwaner.weebly.com/uploads/1/3/4/4/134478239/5458080.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mejavifoxeb.rf.gd/60361060780.pdf
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_50f548bf22774f7d9a54bd9bf2dc1de7.pdf?index=true
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_ca496e3c63624b598fabdf567dab47c8.pdf?index=true
    • http://sojetabusat.rf.gd/guided_reading_lesson_plan_example.pdf
    • http://vutelubuvobu.rf.gd/why_the_last_jedi_is_bad.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_off0000e6bd.bin
d495482d9c989ae16f6a492357f0f6fc636c49959b639254cc7f5ebbd0106d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 5332 bytes
font_01_sfnt_off0000f8eb.bin
1efca8aee90665d7a6a85bd90230e7ea51d40b9059bef905c6698fdae0826f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 10672 bytes

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