Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb0abfc655bc7c2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-07 15:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 061b4acf4c4ecae4f55cbd09d8e62aed SHA-1: bffaeb7bb516161a9e38305f355e0a3706231f01 SHA-256: 2cb0abfc655bc7c2f1758fe8e1bc5fb1a25640466bbcbafcf43c8c89d967ee9d
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, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to external malicious sites. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+to+calculate+the+area+of+a+triangle+trigonometry PDF link annotation
    • http://foxiduwanati.mygamesonline.org/10463945470.pdfIn PDF document text
    • http://virnet77.ru/chromatography_challenge_lab_answersx2xm7.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/25389491455.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/a83aed5eb7091f1.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/44198552252.pdfIn PDF document text
    • https://mipixapotorifa.weebly.com/uploads/1/3/0/9/130969355/dimagakozel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388626/normal_5fc959140ad62.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/6679058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366007/normal_5fffea8ee8eca.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/line_6_firehawk_fx_loop.pdfIn PDF document text
    • http://afracheat8.xyz/24398644148jxj5g.pdfIn PDF document text
    • http://fortysgjdk.fun/tononegedt10tp.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/33895266312.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/24113502075.pdfIn PDF document text
    • http://bloomwithdeanna.com/you_are_the_reason_mp4_lyricstfldf.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/76d61ec2b324d3.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/end_of_open_range_barbed_wire.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/guzonusav.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/razes_do_brasil_srgio_buarque_de_holanda_download.pdfIn PDF document text
    • https://dugepawegozil.weebly.com/uploads/1/3/1/6/131606694/2265380dcd05e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memamawu.onlinewebshop.net/is_twilight_saga_available_on_amazon_prime.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 5272 bytes
SHA-256: 70c1094031e64ca433c1ef3a08deea664cb808820035bb709821fd50d1a9a9b5
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 11312 bytes
SHA-256: cafe81e61c564e578d4590b8f78363b34b7dde16ca4938deec92defeca57d4dd

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