Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd7c7d9fe25c06c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-25 14:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ff91e4de2e42f901acb1ba13c244023 SHA-1: fd8deb899ecb92e0f3d208e410c1682f27345ac2 SHA-256: 8cd7c7d9fe25c06cff7c24ef75735d353c496397d94b59be6a1d9eb50bb749d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to various domains, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=street+fighter+3d+android PDF link annotation
    • https://web-idea.ro/app/webroot/files/userfiles/files/53378223236.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fiwejomupaboz.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/91875160114.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/dojofedewimefuvenuwitix.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/21310917436.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/guguxubibetajut.pdfIn PDF document text
    • https://micsys.in/userfiles/file/wazef.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/33002453165.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/mapedipovabimimezuxapeba.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210908/file/zufiweperexavelu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nedivojet.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/037f9f8cbcfe48b332255e1779b1927b/nogebojerob.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/20533851477.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/weliserura.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/sijijininefisakumunifuw.pdfIn PDF document text
    • http://eko-uklid.com/files/file/fenolevepol.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/67844108201.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fipikevexego.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/31794656985.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/11812316195.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/29425272740.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pavivisegonuxobiziwalik.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/20e04dd70542ea3118e9fa527ca2e31d/vojaromikefajofagul.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xiladonosaba.pdfIn PDF document text
    • https://pokereshop.cz/data/file/92912339573.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://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_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 20984 bytes
SHA-256: bd9d30b6b6eeb64a178621a9166cd28d37f3578c14f6293fe12c451b123c588a
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 10664 bytes
SHA-256: f32ccba140552fc4b4deeda87a4fb15680f56f009d8fa0369c107753cd4d153c