Malicious PDF — malware analysis report

Static analysis result for SHA-256 6343917192b7f715…

MALICIOUS

PDF

90.5 KB Created: 2021-02-27 10:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2aff2c7e59bf29393ca162688158ee1d SHA-1: cb59d45c8124f07bf8b9ffaf2a4fde99cb759fb5 SHA-256: 6343917192b7f71594f7801a2ffdcd0ecfd18d9e9efa1e87ea92e3773e468d42
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified numerous external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to worksheets, likely serving as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://dugedepap.ru/wix?keyword=protagonist+vs+antagonist+worksheet+pdf PDF link annotation
    • http://dududuw.mypressonline.com/nexupesekenupe.pdfIn PDF document text
    • http://kepojitu.22web.org/32641002864.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/0c0fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/nIUgcjf/20441483623.pdfIn PDF document text
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/lafazejexol-gaputazekive.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/xetab.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/Sjfia2Y/jobutepekifugodeli.pdfIn PDF document text
    • http://powezikunuzumi.iblogger.org/apps_to_free_movies_without_wifi.pdfIn PDF document text
    • https://luwumevawosa.weebly.com/uploads/1/3/5/3/135322316/2945958.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/Qageidj/tik_tok_funny_video_marathi_sharechat_download.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/fenujulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/taguxif/42120947432.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/kekafobokukazexo.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/microsoft_access_database_2013.pdfIn PDF document text
    • http://nipuxedexup.epizy.com/bewakoofiyaan_film_song.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/wireless_n_repeater_setup.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_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 5488 bytes
SHA-256: 6717d8bfd61947cf61dd63f7b5d77784f53b9017de2ec172880313cd43348f50
font_01_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 10240 bytes
SHA-256: 5131342c01586b20014e96ff681eaf9f366c34e1b9df83d89759ecd166af6478

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