Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf672ca29ad4958…

MALICIOUS

PDF

82.1 KB Created: 2021-04-24 00:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7d5ac7062caa84ddf7b1c99a5af5636b SHA-1: bc91a5300ca0ad1c3dd968acc600293c220116cc SHA-256: cdf672ca29ad49583bb531e83c43a6a7c5317b6842422b6c012f74341a77654f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and appears to contain metadata rather than user-facing text, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=2005+international+4300+dt466+engine+specs PDF link annotation
    • http://bigmagazin.xyz/62807073180lrbws.pdfIn PDF document text
    • http://optarfes.com/how_to_do_arabic_calligraphy_with_acrylic_paintjst4e.pdfIn PDF document text
    • http://kukukoboda.22web.org/how_to_join_a_granny_square_blanket.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5ffd9e8c289a5.pdfIn PDF document text
    • http://ligelasew.iblogger.org/d-link_nas_dns-323_manual.pdfIn PDF document text
    • http://klossheff.xyz/angle_relationships_in_circles_worksheetocw6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5fee88429c9cd.pdfIn PDF document text
    • http://richmaya.site/tibemifufigemuqqv9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_606374c73e8d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418777/normal_5ffb0cff711fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fde14aba051b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojazudawawuse.epizy.com/garmin_delta_upland_xc_remote_training_collar_with_beeper.pdfIn PDF document text
    • http://losalevova.epizy.com/95662759854.pdfIn PDF document text
    • https://5c51e3d7-2896-491e-a255-1b002e356b93.filesusr.com/ugd/5b6ce5_8c1440217403477c8d9f6242a3a18cbb.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_3593ed9e977449d98c035fb48957a86b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/how_to_install_john_the_ripper_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/glock_armorer_course_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/manual_water_filter_backwash_valve.pdfIn PDF document text
    • http://jigosip.epizy.com/preventive_maintenance_template_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/how_much_do_housekeepers_get_paid_per_room.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/zatugog.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_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 5948 bytes
SHA-256: 0e8d7c466076dbfabb588982d078be4758817800f2500f9f33f863b26f828659
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 11180 bytes
SHA-256: 28a814be790756074a6e9098c22f526eda838cd948ad2ae21db466eede1410ab

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