Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8b03e566c1cc70…

MALICIOUS

PDF

88.8 KB Created: 2021-03-13 21:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3403cad05238d51b74164c6eb3e64050 SHA-1: 989a855bc34d62e6c8184d4814808594e51f30e7 SHA-256: bc8b03e566c1cc705a0c946380cae2c87f6a3ef8086ac0a48dcafc6521e3283e
134 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. It uses an urgency-based lure. 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 0.9993

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/123?utm_term=severe+birth+asphyxia+pdf PDF link annotation
    • http://chemistryplus.space/nusinetvb3m.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/LjdqVKb/depowoxugowatokutovagag.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/bgjEgd4/58315079700.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/802a136fd86ba.pdfIn PDF document text
    • http://leree4.club/100_million_ways_to_die_in_the_west0vf5a.pdfIn PDF document text
    • http://artdebug.site/why_does_kanekis_hair_turn_whitekfxl4.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/3cb423583651db4.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/b8Gbhge/88350582979.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/27552264484.pdfIn PDF document text
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/vufakiwifaru-xonuvakuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/ihjZicb/device_help_services_app.pdfIn PDF document text
    • https://memibufosigi.weebly.com/uploads/1/3/1/3/131383384/3712794.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/5327a0ad-140b-4687-aa98-f1a09e082867/27184871599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8e2336-3b6a-4121-b943-ef19513131a6/82849064410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ccb899-b44f-4f40-b346-59e5610a5f64/tipler_physics_for_scientists_and_engineers.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_eda49a3d48dc4d038e8ee4a93efddb60.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_a3121a658e5b44cd8dc1d3479b0013be.pdf?index=trueIn PDF document text
    • http://newemepakirid.myartsonline.com/bipiji.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/22941597399.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/20327401456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae412ca9-e4b9-4184-97f7-5fbe24e15247/81992638857.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_ecaecaf6cfeb4e718e5bb4b2d44f4755.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_fb29006d35604d43900c72f97782e6f6.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_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 5568 bytes
SHA-256: 453c8640c4c3699ca4c30422b426f08d7483af36991bd04b490a9a0c38c5ca94
font_01_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 10644 bytes
SHA-256: a83a7898123ee76a50b33003ec1e58b783642400ccf700df909e8dd1a81532a6

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