Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf02c184cfde7d6…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 09:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 400265e8647ec933745a486b563aa3bc SHA-1: 961e9745f0ef24ffa0715f1f302c68730610a1c4 SHA-256: bdf02c184cfde7d6777c85eeeb18d3057aeeb2418c7fbdab612dbcb0a0ec7593
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content indicate it's intended to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=degrees+of+freedom+calculator PDF link annotation
    • http://itcck.org/upload/editor/file/metebasudopolomiboj.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/rufonisedubogegaxitizogel.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/34734364560.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/75072022243.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210910175610.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/95946840812.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/69855330980.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/degus.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nalidovaxuridizabagafabi.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210921_040244.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/38477143132.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/5630927430.pdfIn PDF document text
    • https://novsport.com/content/File/77577410401.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/fidatoruwofo.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/molovelofeliwisokugu.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/sadesotisemed.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/74422099745.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/74919563872.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16147355c78035---75092404542.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28977342824.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/71602349408.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/nixexapo.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_off0000aeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFF 10724 bytes
SHA-256: 8b0fea2a55b7e0578d3a212d87d746cb6943fb42992b0476dcf300014b138bd9
font_01_sfnt_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 16808 bytes
SHA-256: ebc2c72c247bb7b4ea1b137d7141a734f2875b814e19cecfa8479c908723853d
font_02_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1