Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bd0458e79c9308…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 21:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25838b3ac2dccfe5d87000dca6b73cf0 SHA-1: c03332e72de082f96d0a52c787914f37f784ef47 SHA-256: c8bd0458e79c930819bed7166c53019e74411a526b02bf76ebaba17c125b394c
126 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 pointing to PDF files hosted on various domains, indicative of a link farm. One heuristic identified a link farm on disposable hosting with UTM parameters, suggesting a spam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hanart21.com/files/userfiles/file/52494435442.pdf In PDF document text
    • https://dadrarad.ro/userfiles/file/80093913943.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/58786293181.pdfIn PDF document text
    • https://advik.net/userfiles/file/fodavexiv.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/rawovuzek.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/43020518462.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/kesawexujutipafawaluga.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zekiragubujijuvoduzegesij.pdfIn PDF document text
    • https://aneri12.eu/res/file/24576660093.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2cf4lpgllphdn6ojf6j0q3eru3/23965210849.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021092215442273499.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/26953857621.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33422398898.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a11b5c36035de787db99abbd6ee12a2d/94159931104.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/79639771960.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/zamavizubowog.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/76960720082.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/sukivavujokugosuko.pdfIn PDF document text
    • https://edusfera.pl/upload/file/doripofivim.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/gubapotuvunipipeforelunid.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/supaberagib.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210907040214947.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/tazajezuwetagobixetubekik.pdfIn PDF document text
    • http://aprt1day.ru/file/96252548120.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/nojilutiparateraxedub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+programming+in+javaPDF 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_off0000b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 17488 bytes
SHA-256: 29bbe35e09d95ce359bba783a8d694793d62e3aaab517e36ee5a8e786645748d
font_02_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 10468 bytes
SHA-256: d1ed8cac66598d57dd09476e7da7a5b146ee6b0d02c4f2c520c14c45a105e3f5

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