Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ef990ced878ef5…

MALICIOUS

PDF

77.6 KB Created: 2021-04-10 14:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e08ed834880a0f938be6ea7a20f3051a SHA-1: 54143b4edf0769ac9faca6543f322d0423f0fe8d SHA-256: d4ef990ced878ef5b23a284b9eb702dd75c3689f2658a728d2332682baf4e992
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'http://mon-fortuneo.best/mickey_mouse_running_away8jmva.pdf', are designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users through malicious links, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=spektrum+dx7se+review PDF link annotation
    • http://mon-fortuneo.best/mickey_mouse_running_away8jmva.pdfIn PDF document text
    • https://befibexa.weebly.com/uploads/1/3/0/9/130969759/topatuta-zorimab.pdfIn PDF document text
    • https://cdn.sqhk.co/desiketomasu/jsjTjaI/6163595385.pdfIn PDF document text
    • https://xuzitimezavut.weebly.com/uploads/1/3/1/8/131856372/61ea20ebe9388.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/icCib9X/dalupivovanekoda.pdfIn PDF document text
    • https://cdn.sqhk.co/muzubasiwu/gjifqhb/70475578055.pdfIn PDF document text
    • http://korecos.ru/buferenanakukeramamofomonyw9m8.pdfIn PDF document text
    • https://cdn.sqhk.co/zujarepifej/97hdijc/black_christmas_stocking_holders.pdfIn PDF document text
    • https://bapajoronugenig.weebly.com/uploads/1/3/4/2/134234589/ruxadodogiwawuz_wetagonorowavu.pdfIn PDF document text
    • https://rusuxizebagujam.weebly.com/uploads/1/3/5/3/135302265/fozax_ruwukalapoze_jemodusutefukop_kokevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/587b9348-ab8b-4b0d-a0e2-3e56ebb8b697/husqvarna_445_starting_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc170db5-d905-4188-9774-089650fc1625/somowasebenenafoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08e8bbd-3cbc-4aa1-91e2-c1e081ee9060/30219754952.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/rijuribexadekadew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abcf91ff-1229-40ee-b790-c161b002100d/40075138818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19061070-ac98-4e20-a646-115b6af1f556/xepefabowubimelemumelo.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/35730892931.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/how_to_use_a_scale_ruler_metric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bb68aa-d8da-46f7-9f93-6aa286f62e41/jenunusojuwakegifunifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80daea9d-4e36-4cc6-b477-bea99e787b27/88215191732.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/konisenitepamaxejejov.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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5332 bytes
SHA-256: c167aab6ea96a78cc3eef8fd9507fabcad099103f6826d079507a01d67644abc
font_01_sfnt_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10932 bytes
SHA-256: f76a03cf34f7eeeea6ad7836c578a5a197189ddeb3a63f499f0f7e335726218c

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