Malicious PDF — malware analysis report

Static analysis result for SHA-256 96da8eda81198821…

MALICIOUS

PDF

78.0 KB Created: 2021-04-26 00:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5a1e8874a93f8cfb410d81ea9fc0bd10 SHA-1: 73d7fe96abdbaec25d824a0812ead0040bb00387 SHA-256: 96da8eda8119882187baf9a8173826134627809c119355595a4131c4bd0c4695
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a campaign to drive traffic to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful content.

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://zajinet.ru/strik?utm_term=google+search+image+by+file+size PDF link annotation
    • http://znohist.site/insta_followers_free_apk1ft5w.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/Rgjgjjh/asha_chilo_bhalobasha_chilo_karaoke.pdfIn PDF document text
    • http://storeplus.pro/mathematics_for_economics_hoy_free_downloadsggra.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/ijYKham/35102332917.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/hggdNVm/juvegigaguwatuzatuwusokof.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/Rjggehc/dimomugufawegorotevise.pdfIn PDF document text
    • http://damizav.iblogger.org/8998864901.pdfIn PDF document text
    • http://vodoroding.info/wifikazunqr24r.pdfIn PDF document text
    • http://topcreditscore.info/rudezolulosesuz1gb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5ffaa97da38ca.pdfIn PDF document text
    • http://gufutaca1.xyz/ps4_gta_v_money_cheat_codesva1ko.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/bEYmuib/vituwegutaw.pdfIn PDF document text
    • https://cdn.sqhk.co/norasoketika/ibPgfhj/jolelevifurusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_60102b37415d7.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/ejdjjEL/smart_recovery_nashville_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/eiagdgd/35815174782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd61026c3650.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://galexuduxegi.epizy.com/bass_booster_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/63483573988.pdfIn PDF document text
    • http://natelizijiliti.rf.gd/budismo_para_leigos_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/what_does_universal_development_mean_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/nellcor_puritan_bennett_840_manual.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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 5620 bytes
SHA-256: ef35e9eaa72c3c2f418ffe83f3ce645100f775850511d04b54c3303beb96b73a
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 10928 bytes
SHA-256: d76b7c8bfe0512da4b1eb0df81bdc739b45ed8bcfd9b1e8549bee410145e302a

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