Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf899327ad81ce2b…

MALICIOUS

PDF

73.6 KB Created: 2021-03-31 10:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 675c3cb3d3cd06aa27062c0f9135bc0f SHA-1: 32f0c2c5668313a69ef4d609110a943050a318ab SHA-256: bf899327ad81ce2b0d06f0b1e3e92737905d939808a32bff8ccf4edd1d2b51fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/award?keyword=le+banquier+livre+pdf+gratuit PDF link annotation
    • http://clientesdkb.com/538599824643u9a2.pdfIn PDF document text
    • http://popularchoice.space/se_puede_comer_mantequilla_de_mani_en_la_dieta_cetogenicagwgn0.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/fjiEQwS/the_world_of_magic_mage_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/Djcghjh/62057110201.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/RlOpQic/70110809144.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/hcOijmQ/irobot_roomba_675_vs_shark_ion_robot_r76.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/ehj63id/xojajifitepanajefiwewoke.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/petuzavodiwevev.pdfIn PDF document text
    • https://dipibuwedaji.weebly.com/uploads/1/3/5/2/135293441/3180094.pdfIn PDF document text
    • http://tranquils.space/what_kind_of_battery_does_a_ford_focus_needktfz3.pdfIn PDF document text
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/taludotadavoderebapa.pdfIn PDF document text
    • http://leaninrzpd.site/understanding_pathophysiology_6th_editioniislo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_e93855c5afbf40379a1e9d358f275fab.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_9f36f829c5864a77a811f9178e00119c.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_02de629f26bc44b2aff3bb3da4dd2722.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/174e9897-d07c-4a1b-85e0-1afdfc0feffe/11161347281.pdfIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_2c0ec07d92f84863bbdb18ddcd484e71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bbf78d-6892-489e-9f3d-c762a2949612/cvs_wrist_blood_pressure_monitor_calibration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7c785b-902e-48a2-a3b1-6011a9306909/what_is_code_p2196_mean.pdfIn 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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 5300 bytes
SHA-256: ab3d14fd7fb7367e285bd637acc516b5b464c010befe86c5965e844aef606422
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 12352 bytes
SHA-256: a6b71377a055a47dcd81c5d3ecee824ad9b18ef6249ca915c0e307f7eec86708

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