Malicious PDF — malware analysis report

Static analysis result for SHA-256 64372977683c4c56…

MALICIOUS

PDF

116.7 KB Created: 2021-03-25 00:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 94ce43822f88e500544677ab97062ab5 SHA-1: 5408846ce5ba55fd18d3d82fafed6fe355afe176 SHA-256: 64372977683c4c56d5c9eb7768dca8a371ad36d4100c50da9414e986f1e3cf15
186 Risk Score

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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/award?keyword=inherited+disorders+of+lipid+metabolism+pdf PDF link annotation
    • http://jipetabonitu.mywebcommunity.org/tutorial_adobe_premiere_cs3_bahasa_indonesia.pdfIn PDF document text
    • https://luwuberukad.weebly.com/uploads/1/3/1/4/131409546/340044.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ager5xW/xonix32_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/idicLij/40141379659.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/ehbgilS/sunday_school_video_songs_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/jdy3jhk/83118471663.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/how_do_you_punctuate_with_quotation_marks.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/fihjdja/wheels_on_the_bus_melanie_martinez_clean_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/jhZjegf/final_fantasy_xiv_races_au_ra.pdfIn PDF document text
    • https://xorimaki.weebly.com/uploads/1/3/0/7/130739578/tovuxavawudazi-fodogutiniwo.pdfIn PDF document text
    • http://jutidewolojura.mypressonline.com/aplasia_medular_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/4tjcYQP/write_on_app.pdfIn PDF document text
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/tares.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://nopugorib.onlinewebshop.net/nawodevowanukofefiwa.pdfIn PDF document text
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_746fc5a6c6d64e298564a64e366c91b0.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_977bcdf218f64c51b98c155d54831f89.pdf?index=trueIn PDF document text
    • http://wufikemofumop.atwebpages.com/95_ranger_bed_size.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_off00017f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F9D 5148 bytes
SHA-256: da80391c6b26f5abdc37263f00ae1d310ab6313846d16ed1bb6714230371e189
font_01_sfnt_off000190da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190DA 11468 bytes
SHA-256: 9cac41a095951488fe7c499dc0995659d45dc61399231ced0d20b4d74e6bdd2b
font_02_sfnt_off0001b722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B722 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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