Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c16ce4b1c553edf…

MALICIOUS

PDF

86.4 KB Created: 2021-09-21 08:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 09a0c63b01613951bb1171a589ab2e05 SHA-1: 16eccf4d577e522b14eec66d858e164456f88081 SHA-256: 8c16ce4b1c553edfb6a8ce4f7b85cd3ae2b946a51c350e4f14ffa41eaab43fb0
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or part of a link farm. This suggests the document's primary purpose is to act as a lure, directing users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=how+to+take+screenshot+on+moto+g3 PDF link annotation
    • http://cuacuonnhaxuongbinhduong.com/upload/files/77489158979.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/besimorameb.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/jakoxa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161333b5d7743d---89109046343.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146ffca5b836---jibozulefulix.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/pojagupanedadufidinasited.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/rimuzu.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/20623889315.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/17859379826.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/83827327310.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/3499166880.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210908_025242.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/1699700270.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/vijavitejunozuri.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/bowisuw.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/25597488468.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/reregefenumodavor.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/nitenulam.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/50857729575.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/pepikabifezujebewarutasi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/98289684970.pdfIn PDF document text
    • http://cutskytools.com/d/files/3470224090.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/14619042757.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 10880 bytes
SHA-256: e3c79bb1235b3283685997cd2e88e353f7b95e9b9ab5ced9de9f5e66d338f00d
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 18148 bytes
SHA-256: 0fef06ea7c991be699aad38148caa77243a75b80a03902f52cea4250dc21ca46
font_02_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1