Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecd49ec32241b82…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 08:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af61b919b8d7a6487ee697254cc444bb SHA-1: ffcb4a0327dd6378988a3394dbf02a14c13be629 SHA-256: aecd49ec32241b82a4789cd1570860232fffed928009f5927fe3491501b4fa65
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many of which are also PDFs, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://babijie.com/upload_fck/file/2021-9-9/20210909170333569342.pdf In PDF document text
    • https://globalcircle.club/userfiles/file/65024017951.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/rebuvuvipuvujavizutikewum.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/47601492981.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/575f8691db667b382d289e115e29d821/80860794176.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/55206536627.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/xivuzopun.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/74531644610.pdfIn PDF document text
    • https://bloc-immo.com/images/15224546221.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/fetilopidabi.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fedenepogolobise.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/pupojipibuxata.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021982214104046.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/2926470004.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26598349386.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614770c4d5ac1---lixiralo.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/diwoteragoro.pdfIn PDF document text
    • http://ipllaser.in/uploads/35110246838.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/61398379567.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/vovake.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-12/20210912015610258508.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/51546331774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+sa+lite+obbPDF 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_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 10076 bytes
SHA-256: 751dd263a9bb659c076c254df36c80cae46843b124455044f0231f4dd3a4dad9
font_02_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 17472 bytes
SHA-256: 80b03a3f2d0e24a99cf40ad71d4e34bbf37f432431882a49db469aa88c62db8a

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