Malicious PDF — malware analysis report

Static analysis result for SHA-256 af01b6b5c15a9859…

MALICIOUS

PDF

70.0 KB Created: 2021-09-20 10:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a83ccb6eb43859f0c41ed85d0402acac SHA-1: b4db129da436bd15907f0cf5e9759f1685ef2ca2 SHA-256: af01b6b5c15a98595a089dfca5d093aafbd90fd32f73851fbb36df89edf04294
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute links across many disposable domains.

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://coretry.ru/uplcv?utm_term=mejor+lector+epub+para+android PDF link annotation
    • http://proreferee.ru/uploads/ckfinder/files/7924778136.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/63015564126.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///84314842087.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/71779598775.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/tuzema.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80cd62791---44514316483.pdfIn PDF document text
    • http://debten.net/UserFiles/File/wasepodadewizovujosuzej.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/goxuzuwodigewibuwusawob.pdfIn PDF document text
    • http://freetds.net/userfiles/file/28294460921.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/92609005518.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/zeponajapaladazizajibife.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/8385821156.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vakumo.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/kujapunadazanunikex.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/xafilivazemobefelisume.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/74660154520.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/81421495606.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/41475119324.pdfIn PDF document text
    • http://gerocuki.hu/user/file/xujabidegowojedike.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/piwesewowuselavid.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/rinavizojabumifif.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/24606561168.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/tesoto.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/978374485.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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 10700 bytes
SHA-256: 88ea9a475470c6047702ca97ec8a7d146706ba332c29b10c9c15abd90b3b0f75
font_01_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 15804 bytes
SHA-256: c40ea3698bb7df1a6c8761eecb464aa5681f7063944606403a5938289de0df23
font_02_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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