Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c9ee780a525618…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 07:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3206589514a5a0940dea942f8a1d955a SHA-1: aa6cef537a82f688264ae28ab5bce26ea8ab92a4 SHA-256: 52c9ee780a525618fc98696c1151631546add1efa1c268e053463b6973eaa871
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://hatinhjobs.com/upload/files/77695332733.pdf In PDF document text
    • http://fine-cottage.ru/userfiles/file/gataj.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/56119380765.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/16835865601.pdfIn PDF document text
    • http://halmar.info/userfiles/file/begotik.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/55556427248.pdfIn PDF document text
    • http://webbuilders.com/files/file/kobizubulaso.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/4851726955.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/44144546527.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/zelerojutazumipo.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/luzegojukolulurozenigu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142518908a27---389908390.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/48864842382.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5553f2977---39708648470.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/sesitagimitazekokalagim.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/30365144400.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/kagoguferesevam.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vudowuziloxojaner.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/71154080854.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/kojojoguw.pdfIn PDF document text
    • https://ewt.cz/res/file/tixodevojuzafilidaro.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/nawikudogewubop.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/junawurorafodujid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+sync+contacts+to+a+new+phonePDF 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_off0000bbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF4 10424 bytes
SHA-256: 5ce6e5d7b4132502fb9ebe59dd19335cbd53a54f49bd208b3e3cb158fb2524f5
font_01_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 16628 bytes
SHA-256: 26a75b1599f858c862ecec35fc35d0bb1ad01cf10510f04dc0e4630882c3888a
font_02_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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