Malicious PDF — malware analysis report

Static analysis result for SHA-256 a976ea402ca6ffca…

MALICIOUS

PDF

63.1 KB Created: 2020-12-30 19:55:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bc433c06a494898128286896c49ff235 SHA-1: 25dbf6c0054dfda878656de98f463aac53746d1c SHA-256: a976ea402ca6ffcaef6440eb6a09f2c29897ec95d58057cfba7f60e59b9d2298
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 0.9998

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 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://traffset.ru/123?utm_term=independent+and+dependent+variables+scenarios+worksheet+answers PDF link annotation
    • https://febixitojujemo.weebly.com/uploads/1/3/4/4/134402622/pokizu.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/jThjggh/fotiduvinomobujef.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/wevewutevi_jepem_pisoditu_vosufelagaw.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/sevek.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/luvusunovinev.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/9f252c7c6210b.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/f8bc1284-dc7d-42f1-a98f-b9e67da27797/xamukixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ebc6af-b209-41b2-88ef-5b02973563cb/lafabodepofaxejad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b62509-492f-4f70-8984-37661df3969c/financial_aid_disbursement_dates_2018-_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18d35c5-7c09-4ad3-8f7a-5253c2bf91dd/zolusegerovevabopaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/oracion_al_arcangel_san_miguel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632c3b60-a685-4d55-82f5-5e799fa83aee/gefoxoladojiwewikariso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d35cf5c-c54b-4c12-96a9-437aa80dc51e/download_roblox_mod_apk_unlimited_robux_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/dawson_springs_ky_waterfall.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/if_you_like_pina_coladas_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66045113-41de-4787-bc5e-40e2e612032a/juego_de_guerra_de_barcos.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_off0000bb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB74 5456 bytes
SHA-256: 2f0884775b9db079c5add8e2bd2a65798eaea0cc4519672b8a7d2f02ad735600
font_01_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 9600 bytes
SHA-256: dafed4121f0369930022660183e6db8f4b74f766cb02712e79cafd46586276b5

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