Malicious PDF — malware analysis report

Static analysis result for SHA-256 852c74d1dfa5469e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 09:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f274b5a9024da8153fd93bf3a1558d4 SHA-1: 069102560410d7bc12a45389a21c955fa2295c8f SHA-256: 852c74d1dfa5469e372cd8c637295228a1cbd7652b17547c981ec4d77ebe10ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous external URIs pointing to potentially malicious or phishing sites, indicating its primary purpose is to redirect users. The PDF structure and embedded URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=chrome+import+safari+bookmarks PDF link annotation
    • https://ltssinternational.com/res/wysiwyg/file/79765891461.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vefekub.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/56719861800.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a68fa9329d51f93df0294ad521722cad/78056841348.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/63718349692.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hijjeh0hebjsimpiigl8716hoc/mibuberemamorogijawu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/sovoroduwo.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/zinekokikawufonomotaxixa.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/25740668949.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/fapobufuwuxukujowajaja.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/72355171004.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/bugofik.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/44840704502.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/41603256160.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210916205347.pdfIn PDF document text
    • http://cx-gl.hu/images/files/63201731505.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210904_114737.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/22288017792.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/wejuxanoxumuwemasiz.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/50397557397.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/9897844099.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/85572216527.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_off0000d2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 10736 bytes
SHA-256: b0058ccb4679ae6746a9cde8b650b7d7eade509a971ab2b02a336a7e192dc8e9
font_01_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 17492 bytes
SHA-256: 790ac1eeec0d3142c5c14526da7ac553d1cdae85c76f9e5d5fa443f50a4f3819

Open this report in the interactive analyzer, or submit your own file for analysis.