Malicious PDF — malware analysis report

Static analysis result for SHA-256 2165a7fb054b08fb…

MALICIOUS

PDF

83.4 KB Created: 2021-03-24 05:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9102e90b48e5f5dfc0fa2f2673282c6a SHA-1: 799c4607d4f27c05766ebb3b4993f2fecc8be006 SHA-256: 2165a7fb054b08fbe174282b1b531bbe87f588ff79458b03af080dfbff0cca15
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to host and redirect to numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=why+is+the+american+education+system+so+bad PDF link annotation
    • https://juzoliposiwe.weebly.com/uploads/1/3/4/3/134322138/jikilososiwifij.pdfIn PDF document text
    • https://xakijugikirire.weebly.com/uploads/1/3/1/4/131437514/vaxofigumed.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/c5fe68a81200df2.pdfIn PDF document text
    • https://zunutupere.weebly.com/uploads/1/3/1/4/131453944/kofulede_womugem_lomerovedivema.pdfIn PDF document text
    • https://fugunizowad.weebly.com/uploads/1/3/4/3/134364761/6986184.pdfIn PDF document text
    • https://modulofironufi.weebly.com/uploads/1/3/4/4/134402713/ridigonavuxamume.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/iFEibhc/pededojodimijotipemu.pdfIn PDF document text
    • https://godusepes.weebly.com/uploads/1/3/4/8/134899552/vogum_kifugorakegebar_vajakoguzuwax.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/1861804.pdfIn PDF document text
    • https://foxaxefaga.weebly.com/uploads/1/3/1/3/131398491/7113849.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/dumuki_sofuge_gibininerizap_ruvem.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/dGhfjgo/1637947285.pdfIn PDF document text
    • https://cdn.sqhk.co/wepuvumug/ajemjeO/5494644489.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/gficdJT/bosaji.pdfIn PDF document text
    • https://gomepenet.weebly.com/uploads/1/3/0/8/130874128/nudajofiwewu.pdfIn PDF document text
    • https://wodaxudufusan.weebly.com/uploads/1/3/0/8/130814186/jogutomat.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/ee4f9a4ff8ead.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_ddd89cf77d6a42349428797d8fb16251.pdf?index=trueIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_18b0ce7d601448ccb124c3e192515531.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_e304b4d680a4482689157c49ab3d2a9d.pdf?index=trueIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_1be9741905784da9a478c37d9a4ea49f.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_8bd54704cf364b29b6513257c0417d35.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_fa3d2b7418324333a45f902d39c12a8b.pdf?index=trueIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_0aae04c2975a4ecb9c9f7e603c4d88f9.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_5863cd0d578f4531909c9b096c89bca6.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_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 5400 bytes
SHA-256: 96279d0a41dc1dca566f17f4ac8c663c44d78e75a1a58d1d84562726a66fc27e
font_01_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 10628 bytes
SHA-256: e391142be132d479cb4b37de9382f657d0f72e8dd683916e6fddc4b199575b77

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