Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57dd2ad095bb608…

MALICIOUS

PDF

85.1 KB Created: 2021-03-23 23:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 75b9a1503de353d5595ef992fb1ea0de SHA-1: 5336e2bf37a6d0973f3ab2acc09af6c4a4fece8b SHA-256: c57dd2ad095bb6087ddb2f6694fcc5749ee171ebbdf3ef74b0e175ed50cb9b7b
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 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=download+font+carmine+tango+apk PDF link annotation
    • http://bujinolemisizam.iblogger.org/plant_vs_animal_cell_quiz.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/wavezinopix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/calendario_escolar_2019_a_2020_sep_diario_oficial.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/mosajuluropanof.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/46791195917.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/26594347597.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/naruto_shippuden_watch_guide.pdfIn PDF document text
    • http://rolaxaja.rf.gd/53646709591.pdfIn PDF document text
    • http://binuwuzipu.myartsonline.com/3rd_grade_math_addition_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b19b58a-0d18-405e-b891-88753293ede8/92923437446.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/what_if_netflix_recap_episode_4.pdfIn PDF document text
    • https://fd01a0c1-3a12-4c3a-bf6b-9bb85f9b1b15.filesusr.com/ugd/f9d4cd_f189ac69de654842afd9f8551c60880a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/buretevav.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/cm_browser_apk_mod_no_ads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c6ca66-5fdb-4b79-89e7-f2d4545cfe4c/retikuzajezopojanojedazos.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/20875859657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/456ec372-0584-4e31-bff4-d621a871aa4c/asl_at_work_student_textbook__dvd.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/wagobijovutifesa.pdfIn PDF document text
    • http://rogomore.myartsonline.com/61563963283.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_eaf355bbc0c344efb065393aa16c99bb.pdf?index=trueIn 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_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 5452 bytes
SHA-256: 466705d8ae22be24b438861e9577d8f695d4a0510cda38867da3d255e8b89c45
font_01_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 11328 bytes
SHA-256: 255d90a16cb39c7550a6bd6a1cb5dd393c714d271906d6fd8e1f73ab07ed13a1

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