Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85f998592af9908…

MALICIOUS

PDF

78.7 KB Created: 2021-03-02 20:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0b0c89cd78dc2428576c489252fccf46 SHA-1: 33c908e7aa9595d9fc5630af2cbb1c51aedd5e6e SHA-256: f85f998592af99080cbaa2ecec6924aee25861791563a58129dc546af99df8aa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a clipboard command execution lure, indicating the document intends to trick the user into executing commands. It also contains numerous external links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. The primary attack vector appears to be social engineering to execute arbitrary commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/strik?utm_term=linux+command+line+cheat+sheet PDF link annotation
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/dobitazifa-repisidupilowot-kilonufiki-sadowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5ff7cae4de34c.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/1000_and_1_nights_summary.pdfIn PDF document text
    • http://ragukir.iblogger.org/kudupumobukemujujap.pdfIn PDF document text
    • https://zunudomulu.weebly.com/uploads/1/3/4/6/134604261/torijelugil-tidijararulekub-mejebazitaliw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_603b7b9a3e3eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_60184e822a01b.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/how_to_study_for_aphg_exam.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/how_much_can_a_pallet_jack_lift.pdfIn PDF document text
    • http://makipoduzoru.22web.org/56151784227.pdfIn PDF document text
    • https://cheatography.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/format_function_in_oracle_sql_developer.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/75222064072.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/zoxananutipemipurubivugi.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/fnma_investor_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/interstate_77_west_virginia_traffic_report.pdfIn PDF document text
    • http://baguzakanaso.epizy.com/assamese_whatsapp_status_new_video.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_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 5092 bytes
SHA-256: d16cd868a020bd77185835827e975214e75d0e5a9416e4c4b89dcaa7b61a15ef
font_01_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 11928 bytes
SHA-256: 48587cf9084fe80fa922bbb300ba71720167a558e517d9ea1072c422a8de887d

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