Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5591b50636528e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 20:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 958fb5852e037b7c4cd840b4691ca775 SHA-1: bdffe76c530b47acc9a91ada8b27aad9f793a4ec SHA-256: 5e5591b50636528ea7ce8cc4a62158f31998364c20d368c315a24abda3688b26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a malicious intent to redirect users. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://shriadinathbank.com/uploads/jexuwo.pdf In PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/kamabujazi.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/87484000753.pdfIn PDF document text
    • https://slide-bearing.com/d/files/vodifusanexuja.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/vamupinalarekofupowa.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/35686849184.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/mekikapefekax.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/89517180405.pdfIn PDF document text
    • https://lecachet.fr/docs/files/gapovasokugojux.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/6473404941.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s3kb3724fsv5814vtq9trmk6ok/39606259675.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/13727580309.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/zoxizelazeriwu.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/98315414070.pdfIn PDF document text
    • https://securitydm.net/slicice/file/xunirusimojodax.pdfIn PDF document text
    • http://taxfreepoint.com/file/27587162119.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/12760457824.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/fifiwiw.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/13189473871.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/ziwut.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/15747448554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=a+quiet+place+prime+videoPDF 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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 18556 bytes
SHA-256: 6d243b9b89f6b9a770f29c0d9424f462fb9612421150af3748a204fe24a38abd
font_02_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 10696 bytes
SHA-256: 4b928e66b5d7cbaa3bb8f729fdff76be5e3ba5c05b1be300439e2a802449dcca

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