Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42e82ab4b87a6de…

MALICIOUS

PDF

170.1 KB Created: 2021-04-01 10:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 29d82e2a96e854a978cd702414a10e21 SHA-1: c7c6d0d1735d66ea14a7439f301e9f72c5f41c66 SHA-256: a42e82ab4b87a6de3fb0a2539c36605691fd92c702c0f6d0e08eb604621b900a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute phishing content or malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kuzutuzo.ru/strik?utm_term=asrock+h77+pro4%252Fmvp+nvme PDF link annotation
    • https://cdn.sqhk.co/vamunidibu/zkidzJb/guzuwinuloratinow.pdfIn PDF document text
    • http://jesopejasunu.22web.org/teturadoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_604d92d99b6c9.pdfIn PDF document text
    • http://joteruraxa.22web.org/58211749303.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/convertir_de_a_word_gratuito.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/dkrquUT/age_of_war_unblocked_games_6969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_604e2321e14cf.pdfIn PDF document text
    • http://zunojuguk.22web.org/ball_mill_operation.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/BgfgcNz/mikaxoxoliwumagadip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropofijegeja.epizy.com/lujona.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_f6e5bea4e8d64da7a03a3fc4283cf53d.pdf?index=trueIn PDF document text
    • http://kiwizenodemi.epizy.com/sitikotaxozemurikogirim.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/57481996619.pdfIn PDF document text
    • http://bufafaloverodi.rf.gd/jingle_bells_sad_version_piano_sheet.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_ed27456eec064d6fb2f843756c71ccbf.pdf?index=trueIn PDF document text
    • http://finubovuputok.epizy.com/76615683799.pdfIn PDF document text
    • http://koberezebum.epizy.com/vitikuledatetoz.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/zavunubepofadijafi.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/youtube_to_avi_downloader_free.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_9ec729e520b5478f97f2a3d589b16825.pdf?index=trueIn PDF document text
    • http://filujade.epizy.com/cognitive_biases_questionnaire.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000faee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAEE 115168 bytes
SHA-256: 8f429d33bb881c0bfe4fb6b772e5019e7f8cda7b24cae067770979948ef57021
font_01_sfnt_off000247a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247A3 5248 bytes
SHA-256: 7dca592a73519290746f5b827d00151abff79648cbcbc4f51f6841d859136967
font_02_sfnt_off00025979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25979 14436 bytes
SHA-256: cc87d987b7f254d2a373eb438e4bde3dacb839acf9a0b5bf8e06698a73e12390
font_03_sfnt_off00028575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28575 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c

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