Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0da70fe03edace…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 02:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2642f34a4f2c291184a1b09fc14e1c1 SHA-1: 43997abeb009cc1a2f7b8fb70e5e989e4a3ba33d SHA-256: 1c0da70fe03edace6215989d8a6a36dd5610490af1627b548043bc60616d2206
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to host a large number of links on potentially disposable domains, a common tactic for phishing or distributing further malicious content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=identification+of+functional+groups+in+organic+compounds+practical PDF link annotation
    • https://hilanguage-com-tw.triangle-design.com/files/80654831913.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/1578607039.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/rexatekoxumap.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/lupebo.pdfIn PDF document text
    • http://shopabrang.com/images/files/galugokipe.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/wazikobuzijufiwafemuza.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/vevimop.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210910053542.pdfIn PDF document text
    • https://vientangluc.com/upload/files/69943414057.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/nunononivikukad.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/puvufoxulonikudesid.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/71680941768.pdfIn PDF document text
    • http://ihdbd.org/upload/files/11879275228.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/81783436694.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/98250872078.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/33441767189.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/32485690317.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3gf6ujf3ee652oslksleqhaoud/menevonewugev.pdfIn PDF document text
    • http://espwireless.net/uploads/file/sumegipevesipiw.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mesemij.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/lalawosixafevumujoxojepux.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ebd91ec3db7aa868a0793b7fe1ebdc9a/fuwimagunejuwigore.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5564661558.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_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 11012 bytes
SHA-256: d79d2045a5cec35937a684eaa8d55980dfcab14d381c14118fac9a0524fd560a
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 17780 bytes
SHA-256: d72c14ffefa8b82118f444ebae570b460567a235864904da749dadea86a0aef3

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