Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03dc085a26762e9…

MALICIOUS

PDF

100.9 KB Created: 2021-04-01 21:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 29ce684f2ac2efbbb82e0bcf8e4f1d07 SHA-1: 0c1c66022e01ef13a11be0cab02cc1af60526690 SHA-256: a03dc085a26762e9691a07225ffb0b28ff9726b570378a572cae9bf4fb859883
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a reference to 'History of sexuality foucault' alongside metadata suggesting it was generated by wkhtmltopdf, likely as a lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=history+of+sexuality+foucault In PDF document text
    • https://cdn.sqhk.co/samojusive/iif5Rbg/nimunij.pdfIn PDF document text
    • http://shlifovka-pol.website/xatifezufikixizut0cxc9.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/CjdQclU/82843425818.pdfIn PDF document text
    • http://usmileofficial.site/instrumentos_de_recoleccion_de_datos_para_investigacion_cuantitativaqomvp.pdfIn PDF document text
    • http://toppiksnack.xyz/85697921309olzyy.pdfIn PDF document text
    • http://osmosiotzs.fun/ccna_certificate_downloadqtsb9.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • http://kivafijap.mywebcommunity.org/tunumifawifokuxok.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/WhdAjaz/galaxy_skateway_shooting_melbourne_fl.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/how_to_work_out_currency_conversion_in_excelhvc9l.pdfIn PDF document text
    • http://aycotoro6.xyz/28085698627z08yp.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/gapojaxumowadusoniloz.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/26507535276.pdfIn PDF document text
    • http://oneitshop.info/how_much_is_samsung_a10_in_usfguu1.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/how_to_renew_my_license_by_mail.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/eSjfX7z/cold_sweat_james_brown_sheet_music.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/76e9e796-ee8d-4596-9ebf-29bd82d3e1a1/ingenuity_swing_battery_cover.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_9534bd98532749c0972f91413a1c8d52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82412b7b-959f-4e57-ba40-0811d69a7610/40947304662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32326936-25ce-4b2b-a677-53a447edeafa/71178445088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60541b1-11b2-4c3a-99aa-17dcf8fb84b2/88709392016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b674f1f9-c9d6-4cb4-b85e-c84954621919/are_the_vampire_diaries_books_the_same_as_the_show.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_bd085302e7854171a5125fbc5fabcab2.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_e65e35d2536b46a9963b8671c607562c.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_f8b7d9ea1ebd49b1ab67aa15e9b21b9b.pdf?index=trueIn 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_off00014f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8E 5008 bytes
SHA-256: e6e572d2f25fb80c82ea9bd70a5cfa6275a71353ad3c0610e0fa2ae68e18ad8a
font_01_sfnt_off000160ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AE 11024 bytes
SHA-256: bf611a14d678e562d418a3e232f67b494c648a737499885c62f24139f1793760

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