Malicious PDF — malware analysis report

Static analysis result for SHA-256 543abba73c59a45b…

MALICIOUS

PDF

125.1 KB Created: 2021-03-29 12:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b6cbe3ad9d3808f8f87f1f503f54ff2 SHA-1: 1939856c37ba94b0666999896b6d13d4ac94d1fa SHA-256: 543abba73c59a45bec0bd6d75a4e2078f707663e2ad82d5facbbc538780428e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://bologen.ru/wix?keyword=speciation+%2526+genetic+drift+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/luwukamuku/CiciTzk/febegopodudomagenivew.pdfIn PDF document text
    • http://all-gopro.com/xofotalegavaralzhmey.pdfIn PDF document text
    • http://getveran.site/45457568985a02p9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_60262d4ae26bd.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/7jjgiT4/super_drag_racing.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/java_swing_application.pdfIn PDF document text
    • https://cdn.sqhk.co/turovonunido/hvOoUhc/ingenuity_foldaway_rocking_bassinet_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/ahbhijh/43723171664.pdfIn PDF document text
    • http://yourlivehelp.com/does_medicaid_have_an_asset_limitrbug1.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/wokemiwomemafulowix.pdfIn PDF document text
    • http://vsedlyatebya.xyz/29766454201ucrde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484103/normal_5fe03f1c8c366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_605070b811e54.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/9100e27b-51ee-4835-be3b-86a14de4f8c7/great_writing_4_5th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52f085c-1fc6-4881-ad30-02f27422e278/fios_router_admin_password.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/mouse_party_psychology_answers.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_6d20d788c8fc4164a24ea51f40bee943.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_c4fe59031e4b4984a7ee250c55e781dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0daf4da-3f3a-45c4-99c8-86c6013592da/connect_directv_to_wifi_hotspot.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_4e5ddde986744b59a30580d4d1650394.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_off0001ae8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE8A 4720 bytes
SHA-256: 4f1c3b40fdc4b9d96a7360ae14e1567e77a6e53a3f5d1dbc74ea18b58706434d
font_01_sfnt_off0001bea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA9 12448 bytes
SHA-256: 6139bc2503696ced5bd7cfe1f14cfefe911d7d795559b484966dc24274930f8c

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