Malicious PDF — malware analysis report

Static analysis result for SHA-256 0253dc714daec88c…

MALICIOUS

PDF

76.9 KB Created: 2021-05-10 15:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f7e5b480507a0a28f5d2c9179bc80b3c SHA-1: 4cabf3dcacd3b22ee4da17a9ac632c59e6803179 SHA-256: 0253dc714daec88ce7c2ff3846463d20febcde60c473c4f90a25c0638cf22d91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lozipotod.ru/strik?utm_term=how+to+connect+ihip+water+speakers PDF link annotation
    • http://sikakapu.medianewsonline.com/4732825343.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/how_to_cite_health_and_safety_executive.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/nEwLLPU/23554036842.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/4jrjbUO/difabafojikojiviremexufo.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/ftRbjer/nail_biter_comic.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/hfhbwjg/9485175177.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/nevasikuwor.pdfIn PDF document text
    • http://gusebozaromurel.mypressonline.com/la_vida_en_mexico_madame_calderon_de_la_barca.pdfIn PDF document text
    • http://mepamoso.sportsontheweb.net/l_anatomie_du_scnario_gratuit.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/17125495120.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/lixuzawugozisovazesiraga.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/eNjgXhh/51424834880.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/hgfBibu/71741104234.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/pululusodogi/free_weight_watchers_recipes.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_75ae0785a0724205bf16eb15fb267d48.pdf?index=trueIn PDF document text
    • http://kimawawasero.onlinewebshop.net/8398487528.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/1048802892.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_81aa5ad590284d63afa9d0ebd863bf90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/36922390834.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_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 5108 bytes
SHA-256: d5fe0a140ee0ece9d84bdbc70b489adf219345c9d2d0235d81d4e4e316778ad4
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 11252 bytes
SHA-256: e28a988ef1f0d4092f2436301b88ecbaa437b4d7c24a09e7bb3aefd3acad41da

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