Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99524c9329b9377…

MALICIOUS

PDF

78.6 KB Created: 2021-04-28 04:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a00b2f19911f44aac41a04ca2cc2a5 SHA-1: e67cbec417bafa640d394255eeb1d30025f9598a SHA-256: c99524c9329b937750b6388a9b43f1a8ad44b61d1b2364a6029cd5d5d0b0d145
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=seaga+vc630+vending+machine+manual
    • http://tarigutese.mygamesonline.org/57183883115.pdf
    • http://medyayazilimtr.com/face_mask_required_sign_printable_spanishtlmuf.pdf
    • http://azorocheat6.xyz/good_leaders_ask_great_questions_free_downloadu53wk.pdf
    • http://suporefebakibur.mygamesonline.org/mogofarekowafagurogifi.pdf
    • http://gatorama.fun/words_to_use_on_resume_for_customer_serviceg303z.pdf
    • http://vurovolapoza.mygamesonline.org/describe_the_amazon_rainforest.pdf
    • http://winoorama.space/re_zero_light_novel_summarymb0jj.pdf
    • http://kaxiwemusemoj.mypressonline.com/relexar.pdf
    • http://rimka.xyz/ancient_greek_map_blankf2kpb.pdf
    • http://nipokaxa.getenjoyment.net/50917852667.pdf
    • http://medgaj.com/66842196668p6307.pdf
    • http://copyrightproblem.com/fimomojitebamikupekedefaiqp6n.pdf
    • http://bijukexamova.scienceontheweb.net/vocabulary_test_template.pdf
    • http://kipigonatusa.iblogger.org/category_management_procurement.pdf
    • http://aydym.club/me_before_you_movie_download_with_english_subtitles2zea9.pdf
    • http://natnat.fun/sunoten8r2f.pdf
    • http://peromopativej.mypressonline.com/fumenunililajupizo.pdf
    • http://songkfrk.site/zekuropewunadobegbwbro.pdf
    • http://xalowazejadiv.getenjoyment.net/new_business_development_manager_job_description.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xodolipifonabo.epizy.com/37493804144.pdf
    • https://s3.amazonaws.com/telasebisu/34676953052.pdf
    • http://fukuselumetu.myartsonline.com/physics_textbook_2020.pdf
    • https://s3.amazonaws.com/pewebopufupe/57686944531.pdf
    • https://s3.amazonaws.com/jedobufudajewu/49879489234.pdf
    • https://s3.amazonaws.com/mikibetiv/99062394697.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_off0000f5be.bin
c49e259e03c299a0ed2b440392d39e4cab2e33d6b1912ec86fabe638598bf045
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 5700 bytes
font_01_sfnt_off0001090a.bin
fb18dedce0e7a12fd60d46a9058b59c893618ab318d7bc5d93e985ce54c8ef4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 10440 bytes