Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b663c2541100b…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 17:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2e8b5efbb9782b73ad4bcb58ca6bec5 SHA-1: c7ed1a6c939a7ace97b46a37661ddc46fbd68779 SHA-256: 9b7b663c2541100bdb41c2e6d5fd8c20ae3bdabf5cbf70fa7931b917a21c66f6
126 Risk Score

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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=my+onlyfans+account+hacked', suggest a lure related to account compromise or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=my+onlyfans+account+hacked PDF link annotation
    • http://westernstudioservice.com/admin/userfiles/file/xagotesuk.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/82338079907.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/kiragulepaxedefida.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/jovemitu.pdfIn PDF document text
    • http://melabo.com/upload/files/zatinunobexadijeni.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/92799471090.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/dupedifotesavaduwafubo.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/59861859594.pdfIn PDF document text
    • http://only-svet.ru/upload/files/26783881954.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a177b042---xapexarapuvudidize.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/70018568146.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/50636439952.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/pevovezufememov.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/20900314725.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/voxuju.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdb5d60cc---35942647406.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/73882993660.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bumesurobatamogedaju.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/noturixiritebifotik.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/35473465160.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/74331154839.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwarezofa.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/24187211174.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/kowatixid.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_off0000b489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 16548 bytes
SHA-256: ff6191bef1ab6a536db53e1e527c0b843f7abdd082fe6d2880a62a958b99430c
font_02_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 10680 bytes
SHA-256: 8136c305070151df6e0f1944ca4c6368efd1d4e7ac522b335f2384a90a2a709b