Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec925f7b6a9c454…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 00:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b6d35d4b903c019547e0a32349f58214 SHA-1: 981b1d9ed5bb52b4711b9efc2b23bf642e036e6d SHA-256: cec925f7b6a9c454de70911256e7ad509c95eca5d4528cf615abc0df2eeecc3e
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/123?utm_term=best+bodybuilder+hd+wallpaper PDF link annotation
    • http://mitatizizuje.mypressonline.com/lozifikedomanisofox.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenodisoda/X6Xjgr7/brookville_lake_map.pdfIn PDF document text
    • http://birjand.design/is_there_any_power_outages_in_my_areadoobv.pdfIn PDF document text
    • http://domavera.ru/girbau_washing_machine_manuals0i9xi.pdfIn PDF document text
    • http://zidoruzeb.22web.org/dufuzuvofiletiguk.pdfIn PDF document text
    • http://awpmode.com/gaxopisuqu7c8.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/cctv_camera_system.pdfIn PDF document text
    • http://krepezh.guru/asus_maximus_viii_hero_alpha_manualrmm20.pdfIn PDF document text
    • https://cdn.sqhk.co/japewaturu/sxTygh6/58805746485.pdfIn PDF document text
    • http://ru-payment.casa/monokofusezoniynojw.pdfIn PDF document text
    • http://douchehq.xyz/28148085916xjanx.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/p8kTljg/33992035278.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/56391829731y63q2.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/vubazolimuxem.pdfIn PDF document text
    • http://distornyup.site/kozuxixupaserininusoaieyu.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/jaNPAhp/16034152509.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepusijanakigat.epizy.com/average_atomic_mass_practice_problems_worksheet_answers.pdfIn PDF document text
    • http://pevitonorefiz.epizy.com/pvc_ceiling_panels_installation.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_15206737247b438d81e8700fc6fb9c0d.pdf?index=trueIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_abd54829bf2248fcaf91459904b7c808.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_c48e4681607b4a2080aa3c3003c4bdd2.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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 5432 bytes
SHA-256: 665fc2b0d69c404ab16aa4ad62fe3183dc1e6b0d3527361adbeae44aae73864b
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 11372 bytes
SHA-256: c070f304fe2699d35108ad4294ca39853de9481c51fecff58ccb1e9347e55077

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