Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e39c7e1ae0831f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 16:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: afcbe7c7aef69c4ef6aab1d65518364b SHA-1: 53f5d0950b151fa0d5a3b3dc90602da39c2b7d81 SHA-256: d5e39c7e1ae0831f51fa0f90e021424b08997901b0f8cb3da9f74f66679bbf73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file 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 or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection suggests the PDF is intended to redirect users to malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://quaisetoiles.fr/img_pages/file/xixenoripugugonofup.pdf In PDF document text
    • http://ty-int.com/files/files/9393612745.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/80961823677.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/67365114056.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/nowubebekerodujajozulo.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/vagodotew.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gisunenavuru.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631427628.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/molowavunenuvojefoxilot.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/zudewiwoni.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/42757812365.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/42703224580.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/60969231658.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/64102985110.pdfIn PDF document text
    • http://zgic.ru/!upload/files/53961242174.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hph6uoqrdma85a1ee800f9jo6n/90478778010.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/23461260833.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/mamazugujezodazire.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lawopasugaf.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/29072514574.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/wuzukolu.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/madovati.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/9813699845.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-04/21090400391572406120dgwjlsnc5k.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dangerous+dave+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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 16208 bytes
SHA-256: 64ab41a3ffc123c66c25b929164ff911a38be45642a6fe14479788ddcc76b726
font_01_sfnt_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10588 bytes
SHA-256: 160070e31b9e84e6b8719af6c605910d920fae8a86ba3711ab85bdb4649956bf