Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6d7da79775e3ce…

MALICIOUS

PDF

75.3 KB Created: 2021-03-08 21:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c0d971c7331cc15c6a05fd55978a70 SHA-1: da57ebb53e0cd8b602d2dd5478d2c6473a669ffb SHA-256: ae6d7da79775e3cef04163a3afc163cb7dd789423a8ef01d9c1b51397ca099ea
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://jacksth.ru/aws?utm_term=bow+tie+pasta+salad+with+pesto+and+sundried+tomatoes
    • http://sufawevugut.mywebcommunity.org/rafolefezafosiremukeli.pdf
    • http://wivuperafuzo.mypressonline.com/zunatafufavofenime.pdf
    • http://zuduwamani.mypressonline.com/adding_and_subtracting_negative_fractions_worksheets.pdf
    • http://tolizidusinakil.22web.org/whitfield_pellet_stoves_manual.pdf
    • http://bawazofo.getenjoyment.net/kimakavar.pdf
    • http://toxipoxekej.medianewsonline.com/is_tomtom_go_app_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ee44d3a-efea-4185-877a-03ae49f310f5/19242853038.pdf
    • http://tixelupaninaber.rf.gd/age_of_empires_2_no_disc.pdf
    • https://s3.amazonaws.com/gurafoga/cadmium_oxide_nanoparticles.pdf
    • https://s3.amazonaws.com/padosumifubobo/rofodufulekire.pdf
    • http://jujonejetas.epizy.com/66410770954.pdf
    • https://uploads.strikinglycdn.com/files/d7266895-8944-44e5-973c-fd6fe8fc30d1/29172685604.pdf
    • http://fukurem.epizy.com/after_we_collided_movie_song_playlist.pdf
    • http://xakagigoneliv.myartsonline.com/zadaxopixewilobomulakud.pdf
    • http://suziwifu.rf.gd/template_powerpoint_mac_free.pdf
    • https://s3.amazonaws.com/mejigavukolu/fractions_worksheets_halves_and_quarters.pdf
    • http://darotevu.rf.gd/is_ben_10_on_hbo_max.pdf
    • http://zalaxorenisev.epizy.com/dosufewajonaxejevolav.pdf
    • http://pulutugorivexek.atwebpages.com/76057754656.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e826.bin
74848cb693082ba62aaaf8a900c17c12f84167b40b948525878efd6908f4542f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 5340 bytes
font_01_sfnt_off0000fa2f.bin
973f1bec10fe1698e465306577b60eded790304a2ba6d2b7bbc1dd3ca7a9cefd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 11068 bytes

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