Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c764aa9afd46be…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 16:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cb9e9204662c43b241ecba3a681c189 SHA-1: ba74c0e6301a9b340150255e984b1852c10b515d SHA-256: 20c764aa9afd46beb663a78cbd9b91cb069d0ede1457aac31a97233eec5183eb
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 external URIs and is identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The presence of embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=beauty+plus+apk+camera PDF link annotation
    • https://adurucui.com/ckfinder/files/41994708931.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/35305301022.pdfIn PDF document text
    • https://pratham.one/file/25705073343.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/49321730137.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/74605172858.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/16612043951.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210911_D1FA75C1CD901F79.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/73320766179.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/masokelezivovufuzem.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc76eb316f---xasojotixasus.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/9701097909.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323ba19ecdb---funamalezep.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/zubenilopanoxekowu.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/suwivigovibu.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/9784365801.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/53223419081.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/87231459351.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/nimija.pdfIn PDF document text
    • http://vlajamo.cz/images/file/24534363937.pdfIn PDF document text
    • https://majubesar.info/contents/files/jugurefulag.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/sajalasenitexejewozuku.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/noxuvin.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/finoger.pdfIn PDF document text
    • http://coumert.com/images/file/zegukibaxolari.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_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 18972 bytes
SHA-256: 9f52a8215de543f279f675fa069e93f565d96802b9419c9e8c5b4707a3c7f035
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10576 bytes
SHA-256: 4bf092a5e7e29aaadab4add6b8ea5971c8ef53cb02393f30f5e10eb53864b60b
font_02_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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