Malicious PDF — malware analysis report

Static analysis result for SHA-256 2682b8355fd5ac2e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 14:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 237983de8fd42dfbd1490bf7a6f81578 SHA-1: d359afb7d0bc7c80f8f21baadef1e7bf3019b743 SHA-256: 2682b8355fd5ac2e9647c9013b7e382b457bd266d2f5513c190e4fefc6ce06a1
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=stick+wars+3+hacked PDF link annotation
    • http://pokewaveanaheim.com/uploads/files/sikaxomuguvo.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/xijotud.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/lawozezilapa.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nomexedo.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/lawemimomuse.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/rovoka.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/34086176541.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lukedufezopig.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/38546820073.pdfIn PDF document text
    • https://lordoptika.hu/files/files/karadawetaxabizegaxi.pdfIn PDF document text
    • http://movediary.com/userfiles/file/kemotogofuronuduxudotibow.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zekuzanelikumek.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/31474676002.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/38209500657.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/lulonevalokozifesiv.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/zulebofuxatinegonoke.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/mepenukusodagixopim.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/40326811202.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/60550978959.pdfIn PDF document text
    • https://led7.ru/file/7102415703.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091545542829.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210909_180210.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/21611106891.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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 10620 bytes
SHA-256: a2d4dd93c29723ac23ead8d35fda016668dc100fd57b65b856ad1f27703a79c1
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 16860 bytes
SHA-256: 68d268a9a3e5761dd71cd5c7270cce1cf68979fedae5d0de1b337cba42262139

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