Malicious PDF — malware analysis report

Static analysis result for SHA-256 857cd9bb88e2c8e3…

MALICIOUS

PDF

67.5 KB Created: 2020-12-17 02:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 788e03a61d15d08db6b33ca7c01e498b SHA-1: 9da5590465f665ce5abfcb8fb3be6337456aed86 SHA-256: 857cd9bb88e2c8e390b612f25bac94965b4ae88a7efab6faf8c52cb0f35a8ce9
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 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=the+quotient+rule+for+exponents PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453730/normal_5fae4c30366ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fa3ad154b08a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fc056cc4afe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5fabbaac5d756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5fa814a5514c8.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/2141449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0d1c64a3cc4058a6b0fc/1606225181525/protein_structure_pogil_answer_key_ap_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/scroll_bar_missing_on_excel_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de133ae1-f109-4acd-b76f-5e2f06c19b8e/62114245459.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6965cd26ff1194f9b5aa7/t/5fd62187481cfa31adbf99d6/1607868808401/ark_engram_points_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555cd84b-82be-428b-b9c4-8cb482f9c62e/2007_toyota_corolla_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4a589e-e9c2-4601-827a-fb6a18935e7c/99336520112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af205157-b80c-4e7f-b095-8390f968b5e0/boston_terrier_pumpkin_carving_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/history_alive_7th_grade_workbook_answers.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_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 4924 bytes
SHA-256: 01ae05c12841b6946a49f3905f253347ca86cd45c7e4959ac49cce8fb194b025
font_01_sfnt_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 11224 bytes
SHA-256: 5566b171630ee62d7d6c7d6e1c76375ba14ed022a2c35ac5f59d6519b4fbb990

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