Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba40666e792411f4…

MALICIOUS

PDF

72.5 KB Created: 2021-02-14 05:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a5832d5af31cb99599085cac55b3eff SHA-1: 9480d82650abec80d528dde843dd046fba221e12 SHA-256: ba40666e792411f49a419982eee7df558a0c486f906bbf7e1bdcad9cfa42b230
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://baarspo.ru/wix?keyword=liberty+tax+netspend+card PDF link annotation
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/19989d00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501794/normal_5fe38b2c81ed4.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/fVwms0Y/personal_assistant_job_description_resume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5ff777a99421a.pdfIn PDF document text
    • http://rodopigigixodak.iblogger.org/atharva_veda_sanskrit_english.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/uTjgohi/pokemon_heart_gold_pokedex_by_route.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/j8DOPjc/computer_launcher_pro_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_6008d68c7b0b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fedc98aad0a1.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/b97gfgj/basketball_goals_for_sale_ebay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383579/normal_6003b6b2229b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481278/normal_5fcbf44de70a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tulakitukubipi.epizy.com/platform_bed_wood_king.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/vepefixesoxunisumose.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/backgammon_opening_moves.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/hilary_lodge_retirement_home_listening_answers.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/math_worksheets_for_middle_school_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 4964 bytes
SHA-256: 720ae4db082a55639bc90f525067a35a21412fdfd7e0458173e15a59c38c56ba
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 10192 bytes
SHA-256: daf9bfb19936a5c1826ca984c6bfa4494ccc653a3a8bf4ee55376d5564bcf8bd
font_02_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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