Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e851c8a484efe39…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 16:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36576ef7520722afb49e689d331bd180 SHA-1: 44a09bb01546f87fee7b498b8c3b77a83aee53d6 SHA-256: 2e851c8a484efe39f4ebd11199ec2e8233ce8027f40be999f5e64e29ead2a3fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=train+simulator+2020+apk PDF link annotation
    • https://toolsatool.com/userfiles/files/973629598.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/32577390791.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/vojadorezidodexivakabe.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/86827643253.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/fepobejazava.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/69282837817.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/logaxodobobiz.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/37611193932.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/22955900352.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1ae6f09b---xesireketorigukuk.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/42941877479.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210913/21091316145366336198orju3gefg5.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3962786f328edd6a29645e6a20d79e9/gezixumovu.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/7442257882.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/toguv.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/fosafaninomati.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/panudufimalefowumaxovejen.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kojolepakanidofigup.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/32484108501.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/77979055506.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/1100469977.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/nuvugapubajewogidureseju.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/53043667295.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/43619434768.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/50588384590.pdfIn PDF document text
    • 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_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 17624 bytes
SHA-256: bc5cf8fcbf9a24f9ef4fdd2b162a148b598e2d3bdd42eae0c9759ad7d6b38f68
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 10676 bytes
SHA-256: 731f5c2fe0247c692f0c32d96c80baad334a3f117388ea76d7b3b27033a8ea94