Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf4a6bafb2c6a1d…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 07:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6afdcac60fbf0a53b6df0199fa2cb690 SHA-1: cdf78aa26bde9e2678f10a77e7c719f9762b9a67 SHA-256: 2cf4a6bafb2c6a1d40a9e494c2d0c870f67cd878067db9c835f4d868e508329f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=rush+rally+3+apk+2020 PDF link annotation
    • https://yocarbroker.com/upload/ckfinder/files/77399762189.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/jiwizugavafezalesur.pdfIn PDF document text
    • http://elpijisystem.com/file/76054275113.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/kapenesawezugejexukal.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/74620262808.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210915_202326.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/vobegovenorusij.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/47842324180.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/xuxutezemewufipavo.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/towopu.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/lamazirumijijujixep.pdfIn PDF document text
    • http://packturf.fr/files/tidebifakuwajiwogel.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/89201049868.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/26435305097.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/puzebilelobosirowed.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/juxirelaturodukub.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/japijesepodunetuxag.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161373a634230b---17720680437.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/60699147296.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/zedezixanewe.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/2695317247.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/sufulekuruwutemuxusoni.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/dixozokofa.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/66312612283.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/sekuwalonetalesifutax.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_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 14904 bytes
SHA-256: 510d1393a6ed7b5c691a8cc69aa46202fa1d65a9b263e6da51deb456654fd017
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 10568 bytes
SHA-256: db87f97725b98329f58b607525479b4300650302c0b077edfa1fb7239ee71a99