Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d91f0e49309cd4…

MALICIOUS

PDF

73.3 KB Created: 2021-02-17 03:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a8921324145d91678e4866666f24bdc6 SHA-1: 4f0d5d78074f93e420fde473db2c7dff5dfd3169 SHA-256: 23d91f0e49309cd47da6cbd3fa932ae25986de02821e04cdaf54131b1429fe48
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a song title, suggesting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=feliz+navidad+jose+feliciano+y+ni%25C3%25B1o+letra PDF link annotation
    • http://cleanup-sale.site/54125696523q7xxp.pdfIn PDF document text
    • http://khanapoorti.com/kozesivonebufazajg95r.pdfIn PDF document text
    • http://wowitaly.pro/information_about_al_noor_mosque_sharjahedy3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_5fdaabb203bf1.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/jdhdhhe/17602323346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_6010f24e2468f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427529/normal_6004b0701e510.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/cbheHhc/bawexovik.pdfIn PDF document text
    • http://carinsusa.info/dofojzfgp6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382618/normal_5fdf9af296c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6020b5d0307d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_5fe7931c9bef4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeponodij/bijupu.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/46044361439.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/adobe_spark_instagram_stories_template.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/44304125542.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 5472 bytes
SHA-256: 1329419e7b590e8b0872676185f968b2b1ac4e61fe31966d539ea95f34a41b37
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 11328 bytes
SHA-256: 5383fe84629fa9fc8e36da44d2f59dcba906a852b906c974a523a0b30edb022c

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