Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f10c7088f22f90…

MALICIOUS

PDF

77.4 KB Created: 2021-02-07 10:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3311353203cea3b3ff71c9472d6e5dd0 SHA-1: 8846e907d913e1c6035baab10a35e863163017a0 SHA-256: 16f10c7088f22f904fb3d163fcd83efc6159361510e381bf425fa808d6b33da0
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://maypoin.ru/aws?utm_term=john+wick+2+rating+parents+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424933/normal_5fe0fc44f2fed.pdfIn PDF document text
    • http://genoray.pro/mufovyoakm.pdfIn PDF document text
    • http://ledy66.net/14125158147iwyt1.pdfIn PDF document text
    • http://topsalon.xyz/momudibiwaru2yv4o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_60127a83e6069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fcdd5072c41d.pdfIn PDF document text
    • http://cosmicgig.com/arrival_notice_formatlxs22.pdfIn PDF document text
    • http://whysmall.space/injustice_gods_among_us_comic_year_5oigk8.pdfIn PDF document text
    • http://axecheat9.xyz/bread_bakery_business_plan_in_south_africab3r04.pdfIn PDF document text
    • http://onlinekartiadesi.com/ninawaziwumikisuvipuvbu3.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/dxhj4gg/81057662697.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/A3ghih3/learn_spanish_free_games.pdfIn PDF document text
    • http://ozalupa.space/fibikefusavubotabs7219.pdfIn PDF document text
    • http://winokuzovew.iblogger.org/knowledge_matters_budgeting_and_saving_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolutiso.epizy.com/21985904409.pdfIn PDF document text
    • http://fisolimemokuwo.rf.gd/gudiya_rani_bitiya_rani_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/alonissos_map.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/hollywood_bluray_movies_free_sites.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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5580 bytes
SHA-256: d1a700833fa5570a701caa6af5deccd12581bc69240c406124d0f86b435ef7b2
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 11552 bytes
SHA-256: 52d245e2cf91c78efb8aa77039651a9bbd4bdea999f30f22b2e43594fbd0efc0

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