Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aadfb69df0c7b6e…

MALICIOUS

PDF

72.5 KB Created: 2021-04-18 02:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7d9465d347f438f2c6fdedf4bdb3fdb SHA-1: 21ca8d43753035e11eeb20d89ae20dd51d1838d8 SHA-256: 8aadfb69df0c7b6e620377065a6e165abdd4cfabd001b2c5294e09ceb97ba1a4
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://nipisod.ru/strik?utm_term=spt+2-gallon+ultrasonic+humidifier PDF link annotation
    • http://rezexepenoma.scienceontheweb.net/2899346709.pdfIn PDF document text
    • https://cdn.sqhk.co/viwukepato/dDkkdic/sisixof.pdfIn PDF document text
    • http://betflixguvenilirmi.com/221984101079fwx2.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/hhihpie/nefidibomifobisenaj.pdfIn PDF document text
    • http://magic-spring.com/a_peoples_history_of_the_united_states_chapter_9_summaryqzulm.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/sHTL9ic/52886179109.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/LWhiAnT/police_car_coloring_pages_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/xibjgh0/79417836725.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/ahehefX/fixemejosotofagewez.pdfIn PDF document text
    • http://naturaleone.space/elite_platinum_air_fryer_recipesi2552.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/e3d242a8-f734-417f-8581-b32b7fbf9ab8/employees_retirement_system_of_texas_aum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f89174-ca83-4d0b-96f3-842360a847c6/xotagowavinizoto.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_088a02084cac4319871d5d0880b93aea.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_02d05dc2cac1433cb2f79fa1019df9e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b777e2-7f6c-4377-970a-d0d7abac7360/german_longsword_stances.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/introduction_to_the_foundations_of_applied_mathematics_holmes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a01456-e7fd-4f13-99ed-0d272b279bdd/dawubawirugefipalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf622d30-fabe-4316-8ba3-027a3866134f/craftsman_gt5000_48_manual.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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 5836 bytes
SHA-256: 0ee97e8cd20402e73de19104af6b05ebb4a993b4d33581b539119cd10bfe67e0
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10568 bytes
SHA-256: 84cbc007d6e9dda2e124a46ddd94a12aca398e31bf694aba49e70df6b2286f10

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