Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f5162c376ed7cc…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 22:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: cee7261289e93afcdbebdc0d6c1c3fe5 SHA-1: 17cc829288f02966a547956ddf9ebc2de9b66006 SHA-256: d6f5162c376ed7cc54187844324370909cff8d343594dc3c917f804aa77a0f68
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=moto+g4+android+7 PDF link annotation
    • http://uniondrygoods.com/fckeditor/userfiles/file/16125174997.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/rukikukapagoxugodarojuzul.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/65815906099.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/zogezimiwizasel.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/ravasajepikopesusubilapo.pdfIn PDF document text
    • https://magatek.com/documents/file/6646346359.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109090756535620.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/25469940187.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/bajek.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/towimotebixixetu.pdfIn PDF document text
    • http://elsped.hu/files/file/zesijopos.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210907_2C13D2C7D4E7CA8F.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/xumivadimakevivodat.pdfIn PDF document text
    • http://ailizia.com/userfiles/3581436317.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cfd1a5f4---29293360417.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/75475562756.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/58799894838.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/wejuwejobibes.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/1475619998.pdfIn PDF document text
    • http://hoachattn.com/image/files/41154402779.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/48661805919.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/pelokotu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1db8b595---faraxorugemudedigefajatal.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/bumekejuvugul.pdfIn PDF document text
    • http://bresky.cz/res/file/78231200130.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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 22848 bytes
SHA-256: f4a386f0df7d829a773a2111cce8bba8e780c3cf952f266a83d9e5a3bc2c5ed3
font_01_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCE 10196 bytes
SHA-256: defe58e2642debbb685e00e7242caa01894f4cfc415cfdfe57708136e047dc52