Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c1277d4ada5f43…

MALICIOUS

PDF

85.7 KB Created: 2021-03-28 19:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 997dce296b282cb1d52cd41a4b0ea87f SHA-1: c534a646f463b448d923f1351e8990bd4357ec82 SHA-256: c8c1277d4ada5f4383968c62b173ec1c765b0fc6e9d9ad0032ca70c5f5728797
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of 'javascript' in a URL and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

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://bologen.ru/123?utm_term=javascript+ajax++file PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408002/normal_5ff365cd24acc.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/Lhbhgjb/ear_infection_covid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6035eefa8e4df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_604960bfb0689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6056881af311c.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/5hjO5gj/61846291157.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/xebanejuliwidufanigedesow.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/geCoiPE/free_ds_emulator_for_android_6_cheats.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/how_do_i_get_a_street_vendor_permit.pdfIn PDF document text
    • http://lidujer.22web.org/15800019331.pdfIn PDF document text
    • http://govovimifakine.mywebcommunity.org/2720743665.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/ihibSYG/94573576008.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/ntG7Bha/wutulovibore.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/zolerazowubow/15052751941.pdfIn PDF document text
    • http://bevowamudad.epizy.com/jedolabujedas.pdfIn PDF document text
    • http://xaxeziru.epizy.com/xatevetakapivi.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/riker.pdfIn PDF document text
    • http://pelasezota.rf.gd/70947783730.pdfIn PDF document text
    • http://dubomebivenu.epizy.com/govoxapatagifegapebi.pdfIn PDF document text
    • http://fokafupu.rf.gd/viwokuwojipoluzabo.pdfIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/lepagapivegad.pdfIn PDF document text
    • http://vebagakid.onlinewebshop.net/zuwebebutuguxapep.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 5204 bytes
SHA-256: 78e3afef48b0cefe7510f5c7c0a5bcc4958e7b8f518a7a2f8779bd240bb4293e
font_01_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 11464 bytes
SHA-256: 15be609ab38df2e7aa6dc29310fbd314d5340257ded058a497e06ec89e9ef94d

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