Malicious PDF — malware analysis report

Static analysis result for SHA-256 1208e3b3b7607db1…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 22:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9b3f3aa719ec99c547a67dfce3a5e10 SHA-1: 6bb3d4216a65fa25e63b4e34d1380039e29ab5a1 SHA-256: 1208e3b3b7607db1b7112bc6384805bc2926b138a1da3b19c79c96a7fb11314c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download' button lure further supports the phishing pretext, aiming to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://faw-asia.com/image/upload/files/35329326459.pdf In PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/webevetonerevalemok.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/73vb392q5nsc1b4kinefmttst3/vepireleleva.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/13167714662.pdfIn PDF document text
    • https://megashina24.ru/files/files/22904591604.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/wizepupibetituta.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/18373753678.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/sepisavedezanusopepejoda.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xupujebezafakabexegekubek.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wisorifufoduz.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/74772101841.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/73638706085.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/jirivuzuzureri.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c171902fc7b0dabbcc2d9716d87d4a94/guvolekanawaxupovabi.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/dutujuban.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/9924652128.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/xurebazojapanaverozifisa.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/16674432394.pdfIn PDF document text
    • http://adice-area.com/pictures/files/19718696703.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fafetedupoge.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/50624308312.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zebetiwe.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109080651493388.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/47184529489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+skilltwins+2+mod+apkPDF link annotation
    • 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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 19396 bytes
SHA-256: 2ed34ca026ae746442e2e5a90b595c9c53e4e6873609fcb1d01439e4445854ca
font_02_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 10620 bytes
SHA-256: b1b467d30e4e85805f89994d99abdc95ce25df6d35ff450c3396d6a0e1d2f429