Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c1e272dd490076…

MALICIOUS

PDF

90.8 KB Created: 2021-01-13 17:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 35c7daeba8af288261209911ae42636c SHA-1: ef39785929ebfa213d2d08a627d298f918024106 SHA-256: f3c1e272dd49007699826768d59e4d634ddac0c5685bcbf6946af34d555bc90d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffking.ru/aws?utm_term=a+catholic+priest+meets+sai+baba+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fec0ba6e9222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f9b6f2dd80cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5f8fbf2b82b68.pdfIn PDF document text
    • https://site-1172629.mozfiles.com/files/1172629/blackjack_strategy_practice_blackjack_trainer.pdfIn PDF document text
    • https://site-1211253.mozfiles.com/files/1211253/answer_to_impossible_quiz_2_question_23.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/jubugifituz_mudet_tinuroxujap.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/rudisotub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f9556ca54d9a.pdfIn PDF document text
    • https://mefarixikokupa.weebly.com/uploads/1/3/4/7/134759110/vuxuzoxedugef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fb5e6d8d62d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5fa42f50d942d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/wazodupemur.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/50541772382.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/61457977484.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/goxabu.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/sleep_deprivation_and_academic_performance_survey_questionnaire.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 5208 bytes
SHA-256: b5d1f22713711c789d6f9b0ecf37828d95e19d4c316d194e1a4e473fc26602a2
font_01_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 10412 bytes
SHA-256: 3676afcc9698f5a255679366dc290026190277796e78c5230c9a00bc530527e4
font_02_sfnt_off00014fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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