Malicious PDF — malware analysis report

Static analysis result for SHA-256 9814e535d0a78328…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 18:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ea890e8cb3cff416a6b4e1314cbcf5f SHA-1: 701f5ce29710757a082385e6a689b255cb873dd7 SHA-256: 9814e535d0a78328dbb4ae1fe3e7abb63896a00cc3dfca29f61b3984dd7a7974
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 disposable domains, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://intervalhousehamilton.org/ckfinder/userfiles/files/49471461239.pdf In PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/74970149146.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/44433784730.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/pevasalimupedij.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/rogaxivikabej.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/54597531727.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/88a1256e330106e1c372ed12ed3ab5b9/28835868219.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/36302669230.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vopufoxunugu.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/56829997628.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/loketudaduxotulawidi.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/duxowizifuxoxabef.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/20725162009.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/wunexemowawovavotide.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/xafedafumakugujurapigez.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/87636331862.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/45567891620.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/65784867716.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab23745c6---kugesibufaxaradevineli.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nikokisiwemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jurassic+world+apk+mod+hack+2020PDF 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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 20228 bytes
SHA-256: 2c5c4e3ca6825994278aaf446465face1ecc50e461c53a8d4dd24a01f31eaa87
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 10956 bytes
SHA-256: 48663c262954d303025441c98759e1da6489b29826fa7adcbe44b577a51ccd86

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