Malicious PDF — malware analysis report

Static analysis result for SHA-256 23da9c9dd973b63b…

MALICIOUS

PDF

73.1 KB Created: 2021-06-11 02:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11811bd2d9b1eb7077a86db40c51f2c1 SHA-1: 66ce69aae3664c0863e5dec42240fd5754b66b7e SHA-256: 23da9c9dd973b63b53b487f8d07d1dec503da75a9a5e1b20d64917e5faf89931
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains like weebly.com and pbworks.com, suggesting a link farm or SEO manipulation scheme. One of the embedded URIs, 'https://infrive.ru/pbw?utm_term=offline+mp3+music+downloader', is particularly suspicious and likely leads to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/pbw?utm_term=offline+mp3+music+downloader
    • https://jurugifako.weebly.com/uploads/1/3/4/8/134869201/dekironefu.pdf
    • https://zirubelazuzo.weebly.com/uploads/1/3/4/7/134747961/bubasevejewid.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/laxoxaxezafum.pdf
    • https://peribiziw.weebly.com/uploads/1/3/7/5/137511101/nemixomenajevexoxotu.pdf
    • https://kimiragijasem.weebly.com/uploads/1/3/4/0/134096233/fimisofisogavekiv.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6052b8481e8b1.pdf
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/e066dfad20f60e.pdf
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/lumud-xenupejuvut-jopavunetokas-kifuraxeza.pdf
    • https://vaxetilunakado.weebly.com/uploads/1/3/4/0/134012354/df611.pdf
    • https://fubewewafipox.weebly.com/uploads/1/3/0/8/130874235/8644450.pdf
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5fc739501ae95.pdf
    • https://zegotasubevit.weebly.com/uploads/1/3/6/0/136097081/6076293.pdf
    • https://dagepafu.weebly.com/uploads/1/3/2/7/132740813/rukomeso.pdf
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/meripu.pdf
    • https://lebudikex.weebly.com/uploads/1/3/5/3/135310552/nomeni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bovozajezo.pbworks.com/w/file/fetch/144473667/is_there_a_customer_support_number_for_cash_app.pdf
    • http://mijatonevu.pbworks.com/w/file/fetch/145093074/dijetozewome.pdf
    • http://najapenoz.pbworks.com/w/file/fetch/144570111/japaxazijepen.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144903063/new_supply_narcissist.pdf
    • http://mapijakemifo.pbworks.com/f/business_development_manager_interview_questions_and_answers.pdf
    • http://tuxowojopugo.pbworks.com/f/download_gta_sa_cheater.pdf
    • http://letonepamusi.pbworks.com/w/file/fetch/144435297/how_many_chapters_are_in_diary_of_a_wimpy_kid_wrecking_ball.pdf
    • http://mapaduzipi.pbworks.com/f/77123984636.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_off0000df8d.bin
7de52a110ebca9c5b6f79000eaac300bbb46936c6ea0ce866cadacf7f4fc92ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 5584 bytes
font_01_sfnt_off0000f288.bin
addebe67a1533559569dead4fb7ce12201735cf8cbdfe48d1dccc2ba3b96694c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10728 bytes

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