Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe150c0ce0ada360…

MALICIOUS

PDF

86.9 KB Created: 2021-04-20 09:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5304c74fb23e08ef309dd7ce820c242 SHA-1: 1b8602abcf51f7bfdbdf5fe5cdef9c7cc17f53c2 SHA-256: fe150c0ce0ada3608deba22e64f05796a598d4260a8d6f12e9df4d0aa3149f9f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=ages+and+stages+of+child+development+from+0-18+years
    • https://tonibefep.weebly.com/uploads/1/3/4/5/134585532/wigepin-sozesegumomad-mides-betak.pdf
    • http://uchebnoe.website/60447561730wka5l.pdf
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/1954839.pdf
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/naroxepe_puxafa_xesejitemununi.pdf
    • https://cdn.sqhk.co/joxonorapa/f7gcjhg/free_fire_survival_battleground_apk_mod.pdf
    • https://cdn.sqhk.co/fewisezux/LpghiiN/wales_online_bridgend_council.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://guzoseta.getenjoyment.net/antenatal_care_examination.pdf
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/vurejave_disazupi_puref_bonitagig.pdf
    • http://copyrightproblem.com/les_miserables_film_plot_summaryyho75.pdf
    • https://cdn.sqhk.co/naxaroja/eyQ0dhf/movie_trivia_quizzes_buzzfeed.pdf
    • http://xolokeminapi.getenjoyment.net/bescherelle_italien_le_vocabulaire.pdf
    • http://tudetiva.iblogger.org/biozone_year_12_biology_answers.pdf
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/9849041.pdf
    • http://difanogoz.22web.org/land_reform_policy.pdf
    • http://fbcopyright-center.com/siveborexibaferuwuwomijar6v65.pdf
    • http://medtechnika1.ru/what_are_the_most_popular_books_to_readqw5hb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_46ccd643f40c4e13bd980b9f86b5a81d.pdf?index=true
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_9d3b7070f6b74a289ef264176250c276.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_205482d7ca114252922408bd7fde0773.pdf?index=true
    • http://wepogevadapafa.atwebpages.com/adenomyosis_uteri.pdf
    • http://kovewerabarev.rf.gd/rozironutowewijo.pdf
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_717f6ec9664643ea8af11e64c7034d7d.pdf?index=true
    • http://pudolajuji.atwebpages.com/articulo_16_constitucional.pdf
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_933042694b714a05860c6df52916aa52.pdf?index=true
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.pdf
    • http://rovosaba.rf.gd/maytag_bravos_quiet_series_300_dryer_error_codes.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_off00011417.bin
dd6b8b320f9c4a6f893721b0c91e4f0e39fad40efd417347fe4e13879cee8160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 6140 bytes
font_01_sfnt_off000128f7.bin
e4efcf975e084dea58b8484d1ea8c458c8fc637e190849a7b85763b0a3402bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 10728 bytes

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