Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f88120394abeb95…

MALICIOUS

PDF

75.6 KB Created: 2021-01-18 19:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef7b1c200eb497275397106b1ff56e78 SHA-1: d76a73feefcd57d2119cf17dd02cd61c933b300e SHA-256: 4f88120394abeb9502a21a74430e9cdbcb9dc9cc338c593fdc8e4b31dd314e04
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=after+effects++free+windows
    • https://kaxuzemerufo.weebly.com/uploads/1/3/0/7/130775382/likesovopakikuxej.pdf
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/7715758.pdf
    • https://cdn.sqhk.co/majumoros/QgNijJa/gusovinedarowubo.pdf
    • https://cdn.sqhk.co/gituridewo/iehgYPG/photos_of_zee_tv_serial_actress.pdf
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/7484827.pdf
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/relenenas_sozalawoserar_forinitalodik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legobegutulo/till_there_was_you_sheet_music_beatles.pdf
    • http://denotepisijolib.rf.gd/68146914100.pdf
    • https://s3.amazonaws.com/jefobexapulow/30728269013.pdf
    • https://s3.amazonaws.com/zikeko/70943991397.pdf
    • https://s3.amazonaws.com/xeropizuwe/naxuvudawixop.pdf
    • https://s3.amazonaws.com/gafedupeba/50190876165.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/campbell_biology_chapter_18_reading_guide_answers.pdf
    • https://s3.amazonaws.com/nijosinizo/ovulation_test_pcos_metformin.pdf
    • https://s3.amazonaws.com/figugipopar/template_jmx_generic_zabbix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc1.bin
e1092602fed6d122aeb9a0d158383728b0d0e4d6ba940ae0ed8c110932067b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 4856 bytes
font_01_sfnt_off0000fc6c.bin
06a808c02ebe310db17e58d6cf28e9a152d67214e045b6b9c5a3d69a52f8ec82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10824 bytes

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