Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35e21a52e4062af…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 10:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 013305f12fb4089c0df6eb36aff66f14 SHA-1: e39ad1c7ec07c7ca1132db013b198e557c3abd4a SHA-256: d35e21a52e4062aff912a1904311f7e9bcee8d86fc688546db6fbbe1f287e6ca
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy clipboard content into a shell, a common technique for executing malicious commands. The presence of numerous embedded URLs, many pointing to potentially compromised websites or file upload directories, suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f909393fdb---zevuxipigekaz.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///zegedupoliluzunofotiwim.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/tatowimovuvo.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/97728064532.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1ec5a6da---talati.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/digirabexexevorexaxo.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/21164210820.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/86354562374.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/dugatiloxojikusifululo.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/deximet.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/katabisoleworagivol.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/bajopomawip.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/85643065300.pdfIn PDF document text
    • http://ktcz.eu/files/files/kumapi.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jevegol.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/zuxaluson.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/pemiteruwixajaxazidak.pdfIn PDF document text
    • https://attack.lt/images/files/fizuvedavafevutoni.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109090049325568.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360a74b5167---latob.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/rawapuxixisu.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/wutafugipujarewewu.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/53561926639.pdfIn PDF document text
    • http://techbis.pl/files/file/42499202161.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/72346475829.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/68525374808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adb+screen+mirrorPDF 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 19112 bytes
SHA-256: f2643cf093914482b208276b635d1676708b51f632e868adb734daa6cc0d23bf
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 10344 bytes
SHA-256: e1edd3201879db08786f8b7f336b307f89c522c0706ef536373a695412d049f7