Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba664f520bfe91f0…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 05:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2781ca22115f552f838c08e23b9c5d90 SHA-1: 1438e234ad966a54920c89788a6618c4be01e242 SHA-256: ba664f520bfe91f0099e837e00e9bced61596a5d59c33e0debd483acef784971
126 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing or trojan distribution. It contains numerous external URIs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains references to 'sheet music' and 'wkhtmltopdf', suggesting a lure to disguise malicious intent. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://pelibifir.ru/123?utm_term=the+entertainer+sheet+music+beginner
    • http://static-get.top/lista_de_verbos_irregulares_en_ingles_y_espaolpfyhp.pdf
    • https://cdn.sqhk.co/fopajuxalaso/bznvibk/botajovaradedigimunexem.pdf
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/a3dd19908.pdf
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/d7dd57750fbae.pdf
    • https://cdn.sqhk.co/xezafube/jh7idjh/adrenalyn_xl_premier_league_2020_21_starter_pack.pdf
    • http://supenujefipolin.iblogger.org/google_analytics_reporting_tools.pdf
    • https://cdn.sqhk.co/fagiseregu/gcgcllN/ginuwotefigew.pdf
    • http://zatuzosej.iblogger.org/28211497200.pdf
    • http://timurberg.ru/zafisezolabotewiruvnm9vi.pdf
    • http://tosety.xyz/super_tanks_l4d2rv6ey.pdf
    • https://dobeluxujopi.weebly.com/uploads/1/3/0/7/130775615/a5214c7a5.pdf
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/6851670.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/zosiv.pdf
    • https://cdn.sqhk.co/mupalewefe/gindBq5/gavorovar.pdf
    • http://dle-tpl.site/delerowu6wls5.pdf
    • http://idealica-uficiale.website/44914113746btiwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e62fde5-96eb-4b78-a99f-a4d781062a51/81931767172.pdf
    • https://uploads.strikinglycdn.com/files/bcf1eb95-fe54-481e-9e4c-f6f428438d24/is_logitech_k400_bluetooth.pdf
    • https://uploads.strikinglycdn.com/files/26c7996d-a1ee-47ee-9d18-f0fc1653668d/apollo_twin_x_quad_thunderbolt_2.pdf
    • http://kimitumepogamom.epizy.com/solvents_used_in_non_aqueous_titration.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_8bf810aee168439bb56d37f2ec97dbda.pdf?index=true
    • 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_off0000fb29.bin
f713dd3305da40f0fb386012c00f22a868e77ca535401e5d582d192d5200ab54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 5272 bytes
font_01_sfnt_off00010ce9.bin
7221c924efc924585f843141e8c1213028b86a1b43010478d148307388cfdaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 11444 bytes

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