Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f8b4efaebdf0b7…

MALICIOUS

PDF

79.0 KB Created: 2021-03-27 22:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a3e36a9ce3a29d9ab31e2bc1861dfdd SHA-1: 2cc741de31537dceecde5cfb7bdf9a3a9825e954 SHA-256: 53f8b4efaebdf0b7aec463d450a7af59957d291d0d8de4fcb3645501684a091b
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 hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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 0.9997

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://vilenefex.ru/wix?keyword=cambridge+soundworks+ensemble+iii+manual
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/wujewa_jinejufarexefa_lotokulo.pdf
    • http://ponemofetu.scienceontheweb.net/somatic_generation_of_antibody_diversity.pdf
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/kumofudakavujobojer.pdf
    • https://ninalekenapuboz.weebly.com/uploads/1/3/4/0/134017067/sitogametanugi.pdf
    • http://difanitukovu.mywebcommunity.org/cdf_and_in_probability.pdf
    • https://cdn.sqhk.co/teketerep/4k8qHjj/65704447477.pdf
    • http://vazewuxu.mywebcommunity.org/dedifukusexiw.pdf
    • http://xufelaketodo.getenjoyment.net/35316440024.pdf
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/vatebesuliz_wuxonim_bibakagib_misirokupuza.pdf
    • https://cdn.sqhk.co/xamitarerivu/7khcicQ/593125393.pdf
    • https://cdn.sqhk.co/jujadiziga/iNGIhjP/55795665475.pdf
    • http://konalofasu.mywebcommunity.org/gross_anatomy_of_the_brain_and_cranial_nerves.pdf
    • http://rajizaloka.iblogger.org/visual_basic_not_working_in_excel_2016.pdf
    • https://fukekagike.weebly.com/uploads/1/3/4/5/134587407/95af4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gulizut.epizy.com/what_is_the_median_per_capita_income_in_the_united_states.pdf
    • http://jopubijako.atwebpages.com/zepibu.pdf
    • http://bupegofawex.rf.gd/a_raisin_in_the_sun_cast_1989.pdf
    • http://donijexufenu.onlinewebshop.net/sizetunemorak.pdf
    • http://disoluje.myartsonline.com/class_11th_chemistry_practical_book.pdf
    • http://guvamimifufirar.rf.gd/domumejo.pdf
    • http://gosaduzunake.myartsonline.com/waduvaredojojofudegolume.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_off0000f828.bin
e599594093ef6163071ac03c88a401366d20dc9efc7ee7942265e6113dad325f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 5344 bytes
font_01_sfnt_off00010a48.bin
75e3c8b83db0a2535652651119bde76905306d30686ee4f0fb4da24af11640cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10672 bytes

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