Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e21779265e6f03…

MALICIOUS

PDF

73.2 KB Created: 2021-02-28 05:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c00f0a188edd95b5d06c749bbcfe4410 SHA-1: c1bae1f3f762aa50e8bd47d2b8441badfd15cacf SHA-256: d0e21779265e6f03e61d1e4d523835966962c101516383400a125f21af05980a
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a link farm or redirection mechanism to deliver malicious content. The document body, though heavily obfuscated, contains keywords related to servicing outboard motors, likely serving as a lure.

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://gimoguvi.ru/strik?utm_term=how+to+service+4+stroke+outboard PDF link annotation
    • http://lenuvivureropi.scienceontheweb.net/teutonic_religion_kveldulf_gundarsson.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/how_to_clean_print_nozzles_on_hp_printer.pdfIn PDF document text
    • http://poguvezi.22web.org/african_music_tina_magazine.pdfIn PDF document text
    • http://rovepofaji.22web.org/48987513640.pdfIn PDF document text
    • http://witexodegimo.iblogger.org/9265917469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxemibusap.epizy.com/napageri.pdfIn PDF document text
    • http://zebuwaxeje.rf.gd/69889334866.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/wiwajigewile.pdfIn PDF document text
    • http://vipoxegoto.rf.gd/no_white_bread_challenge.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/run_itunes_on_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/bach_well_tempered_clavier_piano_sheet_music.pdfIn PDF document text
    • http://rarezutawuwelam.epizy.com/personification_worksheet_with_answers.pdfIn PDF document text
    • http://suxikikafib.epizy.com/wupavi.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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 5308 bytes
SHA-256: 1098c4824fa97e013cf6d4d8c3656a793dc05fa78d32d38c61fe50cd3a07758b
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 10268 bytes
SHA-256: 1f46d6a87bf29ab3350f0904bedb5457d72d9751f15fd91fd986041fe338ae32

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