Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef1dd79885ff9cd…

MALICIOUS

PDF

126.7 KB Created: 2021-03-20 19:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bd294fbeb174c3f28380cfd2bfd6e9ac SHA-1: cfc3c634f5d2c04d41e526a2083481cc31f3ae01 SHA-256: 8ef1dd79885ff9cdc5efd520068df5b4d8e5cd2e3f6f8527616c63d21fc53259
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/award?keyword=ceftriaxona+blau+bula+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5fdff3cf5a256.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/YM9Mjhu/48375447665.pdfIn PDF document text
    • https://cdn.sqhk.co/kopakezoxek/hIuGij6/peluwevisevur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fc911af94410.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/yjehagP/las_vegas_phone_number_area_code.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/hjgeI8L/jspdf_autotable_cdn_link.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/lpjfrgj/75522973250.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/2xHMjem/wordscapes_level_8240.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/gc0hyhg/60248456611.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/YhacAjb/18348720504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_601fae1f519f7.pdfIn PDF document text
    • https://cdn.sqhk.co/kixepijap/Dhadhc8/91966766420.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/b4jgTgh/all_grail_knight_cosmetics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_60085de0c778e.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/bgfGjbS/53885213712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_acbdc1958d41466e88850c9abd689d3c.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_a0dcd973e49b4e3b9514e4af8362e7d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/yajur_veda_sandhyavandanam_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/4512131204.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_off0001b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B077 4968 bytes
SHA-256: 05165eb61f37476f1920990dda010af414b11ff92e3e9491d9a779ba47803c65
font_01_sfnt_off0001c165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C165 13988 bytes
SHA-256: f53dfbb31395cf88abef28b4b1267e91cbf59ab56adf89c8d9c89ae8ccca5753

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