Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3fe1ee7844b5e8…

MALICIOUS

PDF

92.9 KB Created: 2021-09-08 15:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f99f073dfeec4dd03136a493c96398a3 SHA-1: b56943d00c0043739fb27f8fa07c59ed5e413287 SHA-256: 4c3fe1ee7844b5e8f04026caccc6e6026592bf9e7daa93859104cc4e807ad9cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b88enqds47kuk03h9toujjhv6g/pilupukunomiliduf.pdf In PDF document text
    • http://wangguanhardware.com/userfiles/file/3183720355.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/50614695473.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/fajogamoratokatukox.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/50200213429.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/doxibajunuvepikol.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161346a5785fe0---ruxolarupegaziwa.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/55545871529.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/30703066439.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/gutozenurijamoxavaralito.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/32744152198.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/56131233921.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109072027498144.pdfIn PDF document text
    • http://fygl.net/uploads/file/020139376513.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/27201122538.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jesuporanijimama.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/jejijezopipomewubotevi.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/67052284804.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109051320087440.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/mebepuze.pdfIn PDF document text
    • https://mkontroll.hu/File/87799599272.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/18638603009.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/90615017789.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/babebejasanetel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ias+gs+paper+1+pdfPDF 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_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10216 bytes
SHA-256: 59b31a279673038ae174eb40db8dc7043982244bbf6a9abf2ac48b6783ab83e9
font_01_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 18036 bytes
SHA-256: 2bd0251eb6a271cff5845f40d568a46a78b2bc0fd7c18860687e579fc364a0f5
font_02_sfnt_off00014e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1