Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee4d2da29b7974c…

MALICIOUS

PDF

72.0 KB Created: 2021-04-04 10:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4ce197f20ceffdb56c5da94062198382 SHA-1: e5dc71696093c5718518bfc48113318b160d37f3 SHA-256: cee4d2da29b7974cbff2c626b728a9d7dba90749701f7abd2c8cf6fc95c7ae88
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://kuzutuzo.ru/strik?utm_term=write+to+text+file+c%2523+stack+overflow PDF link annotation
    • http://faripofijukevom.mywebcommunity.org/guwagiveraga.pdfIn PDF document text
    • http://mawidoxejonej.iblogger.org/nekabivavixa.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/jatotugudunonim.pdfIn PDF document text
    • http://tuvawom.iblogger.org/fofuni.pdfIn PDF document text
    • https://zesalefol.weebly.com/uploads/1/3/5/9/135994098/vizoxojakakoti_sikuguribanof.pdfIn PDF document text
    • http://visovewefa.iblogger.org/what_are_cognitive_behavioral_skills.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_60153c076b66e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_6066ffda6645e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_604161dc73b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_60490f633ab75.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/vimagugexe.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/awaken_the_giant_within_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijedan.atwebpages.com/honda_gcv160_pressure_washer_pump_removal.pdfIn PDF document text
    • http://wusanobe.rf.gd/29332382186.pdfIn PDF document text
    • http://zadiriza.rf.gd/angularity_number_test.pdfIn PDF document text
    • http://livufibutimogil.rf.gd/adobe_reader_free_download_for_windows_10_offline_installer.pdfIn PDF document text
    • http://zagiwis.rf.gd/old_us_army_recruiting_posters.pdfIn PDF document text
    • http://baperosuvo.rf.gd/50203842471.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_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 4568 bytes
SHA-256: 356ff41d9b4fd83e688a36a896d6b6f3776a62461f9ce35b0ee404d6e2d9f1de
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 11108 bytes
SHA-256: 4cff1bb3dda53dd4e6d55aeca44618f2cabc7485bfbd31329bafd49c5eef104f

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