Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f17ef7e60d0ca7…

MALICIOUS

PDF

86.4 KB Created: 2021-03-13 14:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 789a6275f884162f6d31b448819553ef SHA-1: ef7135ef8e7e3380dfaac77b3fd1104aa8176324 SHA-256: 16f17ef7e60d0ca716b8d970993ad3a7786c80a4a6274d7262165f673d268071
196 Risk Score

Malware Insights

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

The PDF contains multiple suspicious external links, including one to 'vilenefex.ru' and another to 'managerprogram.live', which are likely used to host malicious content or phishing pages. The 'PDF_SEO_LINK_FARM' and 'PDF_SUSPICIOUS_LINK_LURE' heuristics indicate a deliberate attempt to distribute links, and the ML classifier strongly flags this as malicious. No scripts were extracted, but the presence of embedded URLs and the overall structure suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=frases+do+livro+alquimista+paulo+coelho
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/nebuvenisokovageboj.pdf
    • http://jibifiva.22web.org/scale_model_tank_size_chart.pdf
    • http://nutitoku.22web.org/canon_piano_sheet_music_easy.pdf
    • http://marinarus.space/anemia_de_celulas_falciformessnx2r.pdf
    • http://polirobivuf.22web.org/18662571549.pdf
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/dinemu-vimufusu-susewa.pdf
    • http://meetchat.space/lunasanigonekupn7gry.pdf
    • http://managerprogram.live/43591023344falbn.pdf
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/982810f8eb829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8dcc76cd-e45c-4974-981b-800a22da61bd/gewib.pdf
    • https://uploads.strikinglycdn.com/files/b8070046-6d23-42cf-a717-af25316c9bb2/dell_optiplex_9010_all-in-one_desktop_pc.pdf
    • http://roxegubipav.epizy.com/cool_jazz_font_for_samsung.pdf
    • https://uploads.strikinglycdn.com/files/9d1e99b8-f8b8-46b9-833c-0ce9a1d7f619/nulitazuxuniwutiwimatalo.pdf
    • https://uploads.strikinglycdn.com/files/728252a9-713d-4ea8-825b-1480310ba1c5/how_much_is_the_renaissance_fair.pdf
    • https://uploads.strikinglycdn.com/files/d14f0e3b-d73c-4ecd-b587-362b95fea36d/percy_jackson_cast_poseidon.pdf
    • https://uploads.strikinglycdn.com/files/b3e3a425-04b8-4eb7-8219-051de31331aa/34702686276.pdf
    • https://uploads.strikinglycdn.com/files/1e149d28-214b-4567-bcb6-5db2874d8662/what_text_structure_is_used_in_this_passage_cause-effect.pdf
    • http://nagomekivi.epizy.com/scary_stories_to_tell_in_the_dark_trailer_2019.pdf
    • https://uploads.strikinglycdn.com/files/8a5279c0-d584-48ad-b0e9-b6b808179fae/72701477280.pdf
    • https://uploads.strikinglycdn.com/files/04a6f781-f750-4be4-87f5-f664b0d9e57d/comentario_biblico_adventista_isaias_66.pdf
    • https://uploads.strikinglycdn.com/files/e34531e1-1ea5-4ed0-90dc-963ed6d72ef7/waful.pdf
    • https://uploads.strikinglycdn.com/files/b14a8de4-b972-45e6-af9b-01a4b23175b9/what_is_the_best_way_to_learn_dutch.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fca4.bin
91c502ce309fd33ec1b74aca86ec62776ac09529f890ae9ae93c2400dd885d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 5452 bytes
font_01_sfnt_off00010f09.bin
06a557a3528a5edbf97548c44019a7d0aff9d3f5300ad36f62bbf25d5ef569ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 13304 bytes
font_02_sfnt_off000136ce.bin
fe9f335d0611d827ce88dc1c7cba7fb9f264c7c87fb33045be4a8b4ace16f02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 16060 bytes

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