Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff01c83071cc39bc…

MALICIOUS

PDF

77.0 KB Created: 2021-04-05 11:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 700b9df76ca184149e56b3447a7a1e8f SHA-1: 4c97a3dae5ced2f636672af8cf801c16e856cae3 SHA-256: ff01c83071cc39bcc335c79acbe94dbdbae3a4d721c386b141eb36897f5c1d6d
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=bottom+up+estimating+pdf PDF link annotation
    • https://cdn.sqhk.co/kurutuxerodi/ohhIicS/plague_inc_tips_prion_brutal.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/9vtdjbG/pogezedavuloduli.pdfIn PDF document text
    • http://garderob-podolsk.ru/26677190113h45gj.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/how_much_food_should_my_puppy_eat_calculator.pdfIn PDF document text
    • http://tiktokhd.design/build_woodworking_workbench_plans5tf15.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/NjdYlnp/bexukibemunowemide.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/4cghhcX/sharpening_a_knife_with_a_wet_stone.pdfIn PDF document text
    • http://mstmail.space/guwekesusipalafedefes8eg2.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/xAifcGo/26479601102.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/attestation_sur_l_honneur_vierge.pdfIn PDF document text
    • http://doorstepcomputers.com/4851619862506ife.pdfIn PDF document text
    • http://wipujugewubesu.iblogger.org/1689560731.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/telovanepejevumoxato.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/57197424447.pdfIn PDF document text
    • http://skidki-day.shop/whirlpool_refrigerator_model_double_door_priceydye3.pdfIn PDF document text
    • http://disujexa.22web.org/irobot_roomba_675_robot_vacuum_black_friday.pdfIn PDF document text
    • http://vutanojevi.iblogger.org/catabolismo_de_la_glucosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefokirof.onlinewebshop.net/concierto_de_aranjuez_adagio_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/didetazuzufelozubilomo.pdfIn PDF document text
    • http://gaxunexuxulaxed.epizy.com/84794512843.pdfIn PDF document text
    • http://pogotoxevug.epizy.com/saforodola.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_8e2dae930e64451db9a5dec4dc5ed91d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/word_selection_is_locked_2019.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_44862edf6f2a4d169bc5a3e6e07517ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/5544818414.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5280 bytes
SHA-256: a6087cda6f6df407dc9a507cc51928d1b9c9d775809837c175b62bb074a2cf52
font_01_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 11056 bytes
SHA-256: ffc089a62c1df54e4ca0f99843f292a96521621b1b25ba808d0212ce553831af

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