Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3bb5306a8b2152…

MALICIOUS

PDF

92.2 KB Created: 2021-04-01 15:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a129175bfa657381dacd32bd05dca58 SHA-1: cedb3f7ea1ba49b3c818725379e2ca841b77c2f0 SHA-256: 2c3bb5306a8b21522328d357af4ca591e073760cfe715424ced197d9595f093b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/123?utm_term=atomic+structure+worksheet+1+answers PDF link annotation
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/fotaluwu-rigafez-donif-megivobetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6037e18a5003c.pdfIn PDF document text
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/01d5ccb4ed56a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fcd7ea652262.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/trends_in_education_and_school_management_in_ghana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_604d1d32515f4.pdfIn PDF document text
    • https://wurewoji.weebly.com/uploads/1/3/1/4/131438788/3326841.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/pevutexefaxodudutosekef.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/agile_testing.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/nudelilozejesuj-bagopojavo.pdfIn PDF document text
    • https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/fexowofupuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lipabarud.atwebpages.com/boat_knot_tying_guide.pdfIn PDF document text
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_382007034f194615bc2bd616fcc3df18.pdf?index=trueIn PDF document text
    • http://wilaroxu.atwebpages.com/35364833536.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_268029fdd81f41ab8fc796ed9d74a097.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_c2b34802dddd44a28f2ae9bbe01777c9.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_6206c88acc7f4c83b48796902e439dbf.pdf?index=trueIn PDF document text
    • http://kepofif.onlinewebshop.net/cardiotnicos_farmacologia.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_936d0d16e11344a7a12b0665edb85b8c.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_84f1513c738d403082a8aa4d279cff03.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_74d40c4ff88643fbbdd7560c19209703.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f97e946904594c91ac01fbd6c0d5b1b7.pdf?index=trueIn PDF document text
    • http://wobanunep.myartsonline.com/63237678809.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 5088 bytes
SHA-256: 39c9f81153a9a19c3915b39b2d07c9fbce9f477a5add5d6db6f31f90f1193d97
font_01_sfnt_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 10640 bytes
SHA-256: 3565d43dabe97cdadd3ecc7836f9d87b3d6861cd38b7df2d3020dab0edc05255
font_02_sfnt_off000154db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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