Malicious PDF — malware analysis report

Static analysis result for SHA-256 9909ed8e9d343c70…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 08:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 851d5f5d9545b19080218a0add9e8d8e SHA-1: 1c59d866de1ed0ff5a251c0b8abaeb0cefb8935c SHA-256: 9909ed8e9d343c70baa2643289e1960f5f3ab44b1a91ac02154e83c27c1c7664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sicilalluminio.it/userfiles/files/dureromerilebetinuw.pdf In PDF document text
    • https://underworldgear.com/upload/users/files/pipakuku.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/52623936237.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/074339af6e66fbff81706e547698ddb6/82708024978.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/fetokodeti.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/mevukurilu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210908215438554.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/19104147426.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/16899776540.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3621153720.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/64784382663.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/palifa.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jirono.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/fezisulabalazozoleb.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/86464495294.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/siwamadebo.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/rusimusoposo.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/41903842093.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/89434723118.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/27205130762.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/fejigivepubelakij.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109050212186364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gms+core+19+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 16268 bytes
SHA-256: b75402c72d17ce7d1b049ebefa680114ae7a3a704a484b2aba78b7a1dd5d1202
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 10548 bytes
SHA-256: fecb79db022d4a44a5f095d634164b326c9608ecbffc29d4a2226213f6c24940
font_02_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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