Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d74620c2aaf682…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 01:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 410d780908db393217185f3f454d5cdd SHA-1: 327f190c7e9a9c7fb7fec63ecae6ec264d5dc502 SHA-256: d1d74620c2aaf682ce57dd74ca138f01e494d10e6ac7c61a9b355fd690f39ad8
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 a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The primary lure seems to be related to downloading software, as indicated by the 'pokemon+tcg+online+apk+download' term in one of the URLs. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

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://wastran.ru/uplcv?utm_term=pokemon+tcg+online+apk+download PDF link annotation
    • https://sindonis.com/userfiles/file/15041268527.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/56052298167.pdfIn PDF document text
    • http://partnercable.com/files/15559896218.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/sevoromef.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_160535.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/maxejosutobigiwe.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/momonexedafidebodumetatu.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/xevap.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/divabivoborawub.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/lizukazal.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/6076210415.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/50803083904.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7629fcb0---42318271548.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/82228178820.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/jasiwa.pdfIn PDF document text
    • http://only-svet.ru/upload/files/21875903897.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/24139744773.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/62558834932.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/26027153236.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/421218208.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/gibuwapubalepexajakiwe.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/72908268401.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/28654495893.pdfIn PDF document text
    • http://dytac.hk/userfiles/kekadupesujinesefazuvewuv.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_off0000afba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 15176 bytes
SHA-256: 6c0ee51a75e3f6a70f294c4f9eda63ed69d5761ce97f0871f168882ac2f04658
font_02_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 10768 bytes
SHA-256: 33354b3195eadbfdc21e8f8b9f3269f982bf9b1a7035b6b10f3529151d03f224