Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0b57907f3de0ff…

MALICIOUS

PDF

79.7 KB Created: 2021-04-02 18:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26dc61b430b7ade1314626ac593dd454 SHA-1: d1bd916a5655a9e21868641e27feebc1b4ae7d34 SHA-256: 5c0b57907f3de0ff8ea497ac2195df831418db345a88f5b38184dc7a6a527a2e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of embedded external links, a common tactic for SEO manipulation or phishing campaigns. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=the+cave+of+time+pdf
    • https://malugula.weebly.com/uploads/1/3/2/6/132695531/norodugomaxepi.pdf
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/vibevadote.pdf
    • http://elerctum.org/18748022292eer48.pdf
    • http://forecast.bet/kikesulozulesodoveep2og.pdf
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/7064ea24ae8.pdf
    • http://nibitekafo.22web.org/is_internet_research_primary_or_secondary.pdf
    • http://gavewedek.iblogger.org/juvalibiboxenibavigojiso.pdf
    • http://fartook.online/278973650476gm4u.pdf
    • http://vinorama.fun/which_infrared_heater_is_best7o8mx.pdf
    • http://bcpzon4segurabetaviabcp.com/wizexee570a.pdf
    • http://jotijitod.66ghz.com/auditor_report_of_microsoft_company.pdf
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/nesuv.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/5729d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rakabexozu/ego4u_reported_speech_questions.pdf
    • https://s3.amazonaws.com/topipovikapari/delakusug.pdf
    • http://dizerexipit.rf.gd/applied_science_textbook_for_diploma_in_karnataka.pdf
    • http://poxomagilunedi.epizy.com/52881636264.pdf
    • https://s3.amazonaws.com/fajonubinomeder/99894195898.pdf
    • http://diwifesatikebak.epizy.com/mekidozaranelewagex.pdf
    • https://s3.amazonaws.com/tumuzu/motion_graph_analysis_worksheet_key.pdf
    • http://kujewawazereki.rf.gd/gulinok.pdf
    • http://tuvilijemuze.epizy.com/activesheet._protectcontents_false.pdf
    • https://s3.amazonaws.com/wejuvono/89871129118.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/8882757037.pdf
    • https://s3.amazonaws.com/masevewi/leaf_templates_printable.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_off0000fb02.bin
355e1b2b98b9112045d75a7781b24b3d8bc63f09020a0ea9fd16f8abdb257c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 5100 bytes
font_01_sfnt_off00010c4b.bin
e0356adbec27ebe49a16627fe59a0139301d58869dcc63868bc4ab1804d6be91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 10840 bytes

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