Malicious PDF — malware analysis report

Static analysis result for SHA-256 a688151d731a2165…

MALICIOUS

PDF

81.1 KB Created: 2021-03-16 09:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4cc7b43f940d67060e8fd2d33898df3f SHA-1: 2fc24a2bc3cfcafa150f87e091d69018e1c11241 SHA-256: a688151d731a2165b7fa0f5c6c5718c384dfc354fbbe444fbb5338b4d144d8fe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/award?keyword=under+the+canopy+lyrics+pdf PDF link annotation
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/4539558.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/15337932242.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/27229498730.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/cij35ii/69776468077.pdfIn PDF document text
    • https://dexasarejujevi.weebly.com/uploads/1/3/1/4/131454537/vatopexu-winugepib-kemofazid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499653/normal_5ff33f178fb41.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/ja4idja/angry_birds_rio_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_6008b654c089f.pdfIn PDF document text
    • http://ig-soft-team.com/how_to_do_backtesting_in_thinkorswimakxl3.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/3gijab2/75948060758.pdfIn PDF document text
    • http://7lessons.fun/free_download_asia_empire_2027_mod_apkungm7.pdfIn PDF document text
    • http://dle-tpl.site/giwubajamolafixodibi52lp5.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/lotenid.pdfIn PDF document text
    • http://webpost.pro/steel_designers_manual_eurocodepeuf9.pdfIn PDF document text
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/98652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_600fd6f801ae9.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/9472865.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/dKCEggt/tajemaziw.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/hJegeie/a_planet_of_mine_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/can_you_still_buy_nintendo_ds_lite_games.pdfIn PDF document text
    • http://visugog.myartsonline.com/how_to_mix_auto_paint_primer.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_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 5336 bytes
SHA-256: 50e1fd7664cce02b084f6509e6914672b797c670136584e40cad5a9ef9dddc6e
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 11148 bytes
SHA-256: 89b7241f5010d84b1f77633985ec565458ab540716057989a9b02ee6ca6e7d39

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