Malicious PDF — malware analysis report

Static analysis result for SHA-256 733403ef46479774…

MALICIOUS

PDF

76.8 KB Created: 2021-01-18 02:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5eb4170b5109a83b4c2ef1534685d1e4 SHA-1: 1ed823cd82b7e069544cbc65bc8979a12c6d767a SHA-256: 733403ef4647977443dc8f2b8b8fc67d65338ba5977d8e1e225c24db98e5fa18
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords like 'Montecito pet hospital' and application details, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=montecito+pet+hospital In PDF document text
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/rimam.pdfIn PDF document text
    • https://site-1235442.mozfiles.com/files/1235442/bundles_stardew_valley_guide.pdfIn PDF document text
    • https://xajowaluvuro.weebly.com/uploads/1/3/5/3/135303047/4c7813fca3c7.pdfIn PDF document text
    • https://site-1168131.mozfiles.com/files/1168131/townsmen_a_kingdom_rebuilt_guide.pdfIn PDF document text
    • https://site-1176040.mozfiles.com/files/1176040/sirumorexazukovifopa.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/ifnoDic/gemij.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/ginobono.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/Triaggp/fugasasigo.pdfIn PDF document text
    • https://site-1256517.mozfiles.com/files/1256517/matta_material_design_android_ui_template.pdfIn PDF document text
    • https://site-1176998.mozfiles.com/files/1176998/73098057989.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/ji5ihzl/raludizumeropirorefimiwit.pdfIn PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/5705474.pdfIn PDF document text
    • https://vumuzuvi.weebly.com/uploads/1/3/4/5/134506571/turefeti_jokimen.pdfIn PDF document text
    • https://site-1176409.mozfiles.com/files/1176409/gokuwifixonaga.pdfIn PDF document text
    • https://site-1172464.mozfiles.com/files/1172464/zebojudivogabape.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/kabovubupiferalezove.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/fogibi/11477542799.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/wuberegiju.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/combination_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/superstar_bts_hack_apk.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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 4932 bytes
SHA-256: 9dc33eae620fd64ea8324e0d65cafe449ba0cffe1a2a003d542a1ffa30829f5c
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 11044 bytes
SHA-256: 00608e2ec147aca921dc072a8cbfbfad2b3f976b16d2fe6daf96dbb3502c6565

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