Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ecb129468f376d5…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 16:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5e61b7f7d382da4ce453bee2ae23744d SHA-1: 22254f10cd75d706dbb3dd212049f3250cbaa73b SHA-256: 8ecb129468f376d5334025b6a1a61b111397201b52fa9d11d9b30e119bb2ea33
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 is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'wkhtmltopdf' in the metadata and the structure of the document suggest it was generated to host these links, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/123?utm_term=dead+poets+society+movie+guide PDF link annotation
    • http://pudumalezedokav.22web.org/xepiwiwuxesefuzijezox.pdfIn PDF document text
    • http://juwatorota.22web.org/balu_telugu_movie_audio_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/rujojumex/iwGifLA/99034106932.pdfIn PDF document text
    • http://myluckybet.xyz/crompton_s10_brake_wiring_diagrame48ht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_60286bbcbcfca.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/f0MPd5E/26548101782.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/five_night_at_freddys_2_song_lyrics48ufz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_601afd6aed626.pdfIn PDF document text
    • http://limaliwijug.iblogger.org/23721269065.pdfIn PDF document text
    • http://boxupoxegetoji.22web.org/harris_benedict_formula.pdfIn PDF document text
    • http://givixaxumupug.iblogger.org/diabetic_meal_plan_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuguxinise/5EhhsMP/diba_true_shoes_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6055b37a616a3.pdfIn PDF document text
    • http://gallery-shop.site/ladurifajejusugolevt5yfh.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • http://rollernefritmassage.xyz/anitha_o_anitha_telugu_song_freep4gaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_4a182bce625e45428bb391abd60879dd.pdf?index=trueIn PDF document text
    • http://pagupugizof.epizy.com/milton_keynes_weather_report.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_2d83d1c4b4a94c1697b3f80d40c2c93c.pdf?index=trueIn PDF document text
    • http://befadiw.rf.gd/gudojuxaf.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_9bea674cd87947daad26376917b493e7.pdf?index=trueIn PDF document text
    • http://filalawemutul.epizy.com/biliary_tract_disease.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_2c0982d58d2b4ee5bb249af8ea424479.pdf?index=trueIn PDF document text
    • http://wizasagi.rf.gd/tulebajimixokedeguwuj.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_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 5424 bytes
SHA-256: f59f0d60a01ed8c6eab03fc50c68a9360a84e6ed6ecfd570981568fcdc84642e
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 11088 bytes
SHA-256: 6abb14460771ebfd88eb104cf5ebf816e120528363de1ed603bf2814392e6e35

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