Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0276b2c5c2cdf7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 01:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61c22c94cee2faf7866b85fd83a7dfbd SHA-1: cde03029f373bc9404a8f817c2fd8311221c0aad SHA-256: fa0276b2c5c2cdf7a051ca1198ae8b447a1e1f62442a045e3d47e7dff37b8fa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a tactic to artificially inflate search engine rankings or distribute malware through deceptive links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hotelexpert.ro/uploads/files/vupupukuxilifopelepekune.pdf In PDF document text
    • http://faurau.com/luodan/images/userfiles/file/16369161385.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/65849662088.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/14268654538.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/kibazogekakusesufefa.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/91998374846.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/57cshd40li6t7n2rafrpsgbmqs/42405181625.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/gitixulurevo.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/16121166179.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/89880106089.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff2c9b94a---darezipuwexerovin.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/ritimutonifalujosa.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/varowaxine.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/28876606930.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/23939280026.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/zarezipowu.pdfIn PDF document text
    • http://screen.by/images/file/29548143406.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/43497683095.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/88742887751.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fazutokax.pdfIn PDF document text
    • https://luminex.pl/upload/file/38458619902.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/74596797777.pdfIn PDF document text
    • https://stauber.lt/images/files/17125536705.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lidufaxames.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/xiwasajolurusunutap.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/1634504364.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614482aa7a735---58642603696.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/55058989863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+lockscreen+apps+for+androidPDF 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_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 10756 bytes
SHA-256: 52d5dbad6aad9607b59e44536b9c86cd06cb5ea28d8081993b34e68175ce09d1
font_01_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 18264 bytes
SHA-256: 90708506e3cdf2afe3296f2870c214177815cbb1e23c6210f39a2b2a31815fd6
font_02_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1