Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83328c05f73403c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 08:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a155f464e47bb27ad97e7c5fba2912a5 SHA-1: 699d61510947d20eb96ab6232e432968afe11bb5 SHA-256: c83328c05f73403ca4755ff325baf3bc04b77a2a607fb9863cbc81fb74c2bd59
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a fake download button and a password lure for an archive, common tactics for social engineering. Numerous external URLs are embedded, suggesting an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=how+to+disable+sim+toolkit+in+redmi+note+7+pro PDF link annotation
    • https://kiptep.ru/file/97415079099.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/g5eassnparno8d26bkif7q7ovm/19145358276.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zejesigizo.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/47567603110.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/78645161418.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/wumamowobiremejugita.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/sesorib.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/79519746567.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/guvedenaguviwovi.pdfIn PDF document text
    • https://produse-zilan.ro/files/guxabozivipewogedu.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/nimojok.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/9648203077.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/90299810821.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/meluxux.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/80205516816.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/38697840789.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/85193721044.pdfIn PDF document text
    • http://forti.in/userfiles/file/gefiwurexel.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vekefemimijerunufudugofa.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/volined.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613114196c022---88779523618.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/fiwaninawalumomunozexi.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/worogezidu.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/zetowegitof.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_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 10912 bytes
SHA-256: fd9815efa45d2a49a157430307fa01d99028d04e25d9ab4b595eaba2f1af7ee5
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 19612 bytes
SHA-256: 664f0d81724c027c0a3f0509876088bd3fe6af53e1b7245942b5b812f769acd6
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1