Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d3cb66a4bffbeb…

MALICIOUS

PDF

66.9 KB Created: 2021-09-14 11:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0a45bfe99f6d4bb4a3cd1c7a5e5f159b SHA-1: dbc8ef80e7cfe26787088b5458c29c2fde2a0c91 SHA-256: e9d3cb66a4bffbeb751d26ad028a54877ef9b929bf61357c0a1632366cf235dd
124 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. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to evade detection by distributing links across many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7514

Heuristics 4

  • 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
  • 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://carbonelite.ru/file/2721314205.pdf In PDF document text
    • http://tccsrl.org/userfiles/files/75199513582.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/vasixeletadex.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/fupujigabezoj.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/69798322581.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/47112690500.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/ruxaruxunag.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/60039880142.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/ruxunovepikogajewi.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/kamatiwejig.pdfIn PDF document text
    • http://scro.ru/pic/file/14452268007.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xatodebisefofotakax.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/tipusafikitofuz.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/zuxudafunemilixatewejexos.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/pedegaxikutugotiguretige.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/54629988214.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/doguzozedupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fortnite+free+v+bucks+generator+2021PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 11132 bytes
SHA-256: dc98474dd0c8537b5e9d28207ba1167bcb18ae08785e9c13692cccbd951ee146
font_01_sfnt_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1