Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c72d3eefd6b341f…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 18:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e190b681c8692850ef5546c36a44465e SHA-1: d0498f1cf29b9a2942fae3f2225046dce4a51610 SHA-256: 9c72d3eefd6b341f58b5d01b9970f76425033d74ac0d11dae8cab33417cc081c
196 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. It uses a LOLBin command-execution lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://crophysi.ru/strik?utm_term=vizio+e601i-a3+update+firmware PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487197/normal_60004692ec3fb.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/4e93e3018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5fdc179d9a226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcd81309eead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_601224e6be946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5ff01f0885c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450259/normal_5ff39c78b9a15.pdfIn PDF document text
    • https://static.s123-cdn-In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/legipalofi/natural_treatment_for_arnold_chiari_malformation.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/6726798491.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/blank_clock_face_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/total_bodyworks_5000_workout_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/boutonniere_deformity_osteoarthritis.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/curly_hair_tarantula_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/google_maps_android_api_v2.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_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 5628 bytes
SHA-256: dda631ec3441dc0969da756fc2481f5dabcc3ce2601d8545e21042d9b70bee44
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 11228 bytes
SHA-256: b53afe01405e5ffc5d03cee53fa9be555b7c18f68a62c30e78b81e461238d040

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