Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe5379e202cc92f…

MALICIOUS

PDF

73.5 KB Created: 2021-02-20 05:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 79efa6599ed1c0e58519221f51f6796e SHA-1: 81e5bde57a42c22ec19986ce6be2b240b858d42f SHA-256: cbe5379e202cc92ff6e4aa14d99297c886c9731719208d1c8d1a8710807ded21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. Heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS strongly suggest malicious intent. The ClamAV detection as Pdf.Phishing.Trojan further supports this assessment. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=how+to+become+a+mcdonald%2527s+crew+trainer PDF link annotation
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/wakefatulixegi.pdfIn PDF document text
    • http://newser.site/century_21_store_hours_westburyllwdl.pdfIn PDF document text
    • http://cocobuka3.xyz/810225018610jvc2.pdfIn PDF document text
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/4dc6d0.pdfIn PDF document text
    • http://nelibagaxo.iblogger.org/words_to_describe_an_innocent_child.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_602839865491a.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/ejaGgez/57677451612.pdfIn PDF document text
    • http://gufutaca1.xyz/pinball_game_music_video_waploadedvqhyi.pdfIn PDF document text
    • https://cdn.sqhk.co/podizapexiv/Lgjhhjb/fawidizoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jikokajogov.rf.gd/cancer_my_chemical_romance.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 5100 bytes
SHA-256: d1133d6b4db2b0abb8738e246f1ff33f73c65057ec9c711b997ca58fb3095180
font_01_sfnt_off0000e5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 10828 bytes
SHA-256: 90416e9db9d1220bd173178671c3370c47380fda90bbcff32a94e4aa4fd60a45
font_02_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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