Malicious PDF — malware analysis report

Static analysis result for SHA-256 7871926db6ba7f58…

MALICIOUS

PDF

76.4 KB Created: 2021-09-09 07:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b749f83ff7e61be3ffbf381a4ba14c6 SHA-1: 74032259357ca7d85ea0ad9790f4ce72b2470e24 SHA-256: 7871926db6ba7f581425446654f5d2a4a8bc5d6ea60873cb0f5be8fdbb7f1122
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://tradeweb.es/userfiles/file/757107159.pdf In PDF document text
    • http://clairerolo.com/userfiles/file/96659295062.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/lagev.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/77886786372.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sidizuwugabovafaz.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613926dfb03d0---sitebotupezawoweriza.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/43120201046.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/52661588276.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/20082937206.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tuvajidasovisodano.pdfIn PDF document text
    • https://pecsikult.hu/files/file/nepabeza.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/83958583883.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/kafapivavo.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kevuzibigarezoge.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/59923405413.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/27033956863.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/lisirexi.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/81726468514.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/30198135503.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/rixigok.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/65418056359.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/durebigovazisafowejojog.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/xulazotadux.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354cc86bae0---59460896401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=construction+game+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_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 10892 bytes
SHA-256: a6e1ea38af235e6d9fad70a29f95f078703435a74e23ab342cd7df3456e4c665
font_01_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 17656 bytes
SHA-256: 3014973e730fe2ddb63e23e55d2abae87e5d0a1be555ab02f6eeb724b4679ac1
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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