Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d0ddef80460fd0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-02 10:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5f5c7101e6759f650b1b18ed27d5b1b8 SHA-1: 888335bca21e1e3b3da69d7d82bea0ac0c94edd6 SHA-256: 82d0ddef80460fd0a06c65871484915d55ac6fa35974bcb2138b381087d680c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Analysis revealed numerous embedded URLs, with a significant portion pointing to disposable hosting and employing UTM parameters, indicating a phishing or malicious redirection scheme. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=class+paul+fussell+audiobook PDF link annotation
    • http://dewisazovuvoxi.mywebcommunity.org/dremel_multipro_model_395_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fubemabofof/egcDicq/monofebolajevozifazawebu.pdfIn PDF document text
    • https://cdn.sqhk.co/kofisosiz/gwxWCNp/501_free_new_escape_games_2_level_182.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/how_many_quarts_is_a_power_pressure_cooker_xl.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/eXLIibO/asphalt_xtreme_rally_racing_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_6026b57e4186c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5fcf11adcb4b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_602d9edddca12.pdfIn PDF document text
    • http://golixudib.mypressonline.com/69150988205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fe1f8d55d402.pdfIn PDF document text
    • http://sfhgfje5df.xyz/nowuwisile9195k.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/Nhhy8tx/nct_127_offline_kpop_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_60388f3390962.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/NqhhhiN/color_me_rad_5k_pittsburgh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/accounts_receivable_balance_sheet_presentation.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/nosinobivivimezir.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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 5048 bytes
SHA-256: c52c018d0cb362b2c1d57cde25467abd570c340a33d0966e796bb5d70ea5d8d9
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 11544 bytes
SHA-256: 9375916a6c6ac53145c48a7c65f9f764e5263bfc3d2c96592b0e829cb2513ca4

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