Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5484fe2197fb9ab…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 13:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1228364213bc624d60219adb2194e11f SHA-1: e6be72a140527287cee6a42a39260fd8b23449fa SHA-256: d5484fe2197fb9ab17fb8f913da4fb6f6b3a4e2ee6e76c197541ecb0565c4844
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://mezovuduw.ru/123?utm_term=free+boat+building+plans, is likely part of a scam to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://mezovuduw.ru/123?utm_term=free+boat+building+plans
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/5514560.pdf
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/lukusolelumaz_lerimovibuzozuf_burul.pdf
    • http://tapasin.sportsontheweb.net/apprendre_l_italien.pdf
    • http://bezufosaga.iblogger.org/fazelemaro.pdf
    • http://nemugub.mywebcommunity.org/aurelius_augustine.pdf
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/6094304.pdf
    • https://fedebeforejasu.weebly.com/uploads/1/3/4/4/134498020/lifutov_bixodi.pdf
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/vefimet.pdf
    • http://geparup.scienceontheweb.net/art_models_free.pdf
    • http://jimupitakonumi.iblogger.org/16456242680.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_76e74add7fa1497ca4180892d6b00b94.pdf?index=true
    • http://minirulo.epizy.com/21961805099.pdf
    • https://6e6ad6c0-90f2-4367-a025-4e24aeda1d0e.filesusr.com/ugd/c9b7fc_3eb5f481472546a2bd2e61ccf8576729.pdf?index=true
    • http://bixodog.rf.gd/chrono_trigger_official_strategy_guide.pdf
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_fb88368bc3964f1ba4067b268e128224.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3fb5476-7e46-46da-94dd-2ac1c83980cf/duracell_750_jump_starter_review.pdf
    • http://felepenedebopus.epizy.com/angielski_wiczenia_sownictwo.pdf
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_eacc714960bc473d8cc12814a420958d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5702c5e5-c874-4040-b12b-d1c47a908978/wiretaxufewazevadadava.pdf
    • https://s3.amazonaws.com/dudurat/zaxuginanekodovujifikad.pdf
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_d0964a7bd9754fe6b62fa1669f8ce65b.pdf?index=true
    • https://s3.amazonaws.com/bejideba/bhaagamathie_movie_telugu_tamilrockers.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_off0000f74f.bin
d1b7696aa0ff6788345f9633d471ec71c456b044144c19b0c3a066b3c62a3897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 5224 bytes
font_01_sfnt_off00010919.bin
cc4c106a86c83c0f6b2705d821ad1a08f97d84fe92ecc9ed7e80f20af0db01b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 10820 bytes

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