Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e503c805ca5dc6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 01:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6abb708d1f18a82b52962c46197b8d78 SHA-1: 78b1e3f45972eb9d7de6bcf6c13f450451258c14 SHA-256: f4e503c805ca5dc64aac05bad62b817f78bfc2e54589d46cbdfa877c5e5a146e
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=midi+to+usb+c+cable PDF link annotation
    • http://barajofa.mywebcommunity.org/kaba_simplex_1000.pdfIn PDF document text
    • https://tejojixamabaje.weebly.com/uploads/1/3/2/7/132740549/jabedikij-biliwilapulov-bovepuzemavib.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/18207395046.pdfIn PDF document text
    • http://sidipizifemu.22web.org/dasijapubefuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/OMiftic/76724977229.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/dopaboxa.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/46615429198.pdfIn PDF document text
    • https://dadopulemuxujew.weebly.com/uploads/1/3/4/3/134375911/lorotul.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/cX6gEJu/ropozuz.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/argumentation_dans_le_discours.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/AA8Dgjq/dotofobogu.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/liwivezatokukawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_1f05148c6c7e43ebb7cd6f52974ea20b.pdf?index=trueIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_d375adf9c1a4467a8d362327c6129c23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/shure_qlxd24_b58_manual.pdfIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_bc912f9c4458493181aaf88b473c3d3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/emotional_saiyaan_full_hd_video_song.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_1746db098ff441838a7ef443d9c89f0d.pdf?index=trueIn 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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 4984 bytes
SHA-256: 89c201cd76797a40999734c6dfd64a664846735cd655270523bc94401c4618fc
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10772 bytes
SHA-256: ab2066997a71523580576d7b7e3dd1fedc02edae7b0a9d7c0087dc360213aba3

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