Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e38bf17b3c30bd…

MALICIOUS

PDF

72.5 KB Created: 2021-04-09 01:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 21ae7e85ff272c649e10040ca407c132 SHA-1: e021ec472143700e7db7fad241ad2f04c41db70b SHA-256: c4e38bf17b3c30bd156142d057d94962f2e29a5890e96ff4c07580ebfe79c97b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting. The presence of multiple external URIs, including one pointing to zajinet.ru, suggests an attempt to redirect the user to malicious content. Although no scripts were explicitly extracted, the PDF format and the nature of the heuristics suggest potential for embedded malicious JavaScript or other exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=landforms+printables+free PDF link annotation
    • http://sparzha.club/all_green_lantern_comicstwt2u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6020544bbe189.pdfIn PDF document text
    • http://3-bureaureport.info/xerogegiwuwovakiripiavhpg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5fe7ee11d1510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_604d63d5a8abe.pdfIn PDF document text
    • http://walabowagem.iblogger.org/43311028728.pdfIn PDF document text
    • http://return-0.com/gre_math_sectionff40h.pdfIn PDF document text
    • http://dokolifaritib.22web.org/advanced_swing_trading_strategies_to_predict.pdfIn PDF document text
    • http://hookup157.site/44444275571ejwqb.pdfIn PDF document text
    • http://fbdirect.site/garmin_gpsmap_1242xsv_plus_touche37ka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzoxizusuzu.epizy.com/arthrobotrys_oligospora.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/70070695871.pdfIn PDF document text
    • http://valodabopovox.rf.gd/sejizi.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/xukeluzalenidadoxetino.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_07b3bb53407a4162bc9590ba16b43d60.pdf?index=trueIn PDF document text
    • http://tavupikegoseri.epizy.com/u._s._history_timeline.pdfIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_728b6447454a4d3a9416d45232e686a1.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_04ac8321fa064438804227b36d6e1cf1.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 5268 bytes
SHA-256: 94eb37769d2e9a11f80caaf138c6f6a0a21a03690ff0ffde8b3c3f05ca7f02a1
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 11200 bytes
SHA-256: c42484467195d133d761d6f39f4d29457aa4da9abad3292b117bf7d4ca8cb50a

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