Malicious PDF — malware analysis report

Static analysis result for SHA-256 5378d91a288c2119…

MALICIOUS

PDF

82.5 KB Created: 2021-03-13 14:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d95806cf9ece304795cd3ba5870f9667 SHA-1: 9098c6119e4b4a4fed55c40c1e183224a88eb93c SHA-256: 5378d91a288c21197134abb0c22bc6cccda29f70656e758d9f70448690c327c5
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, contains keywords related to academic content, likely a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=cbse+syllabus+for+class+10+maths+2020+19+pdf PDF link annotation
    • http://zixaxagewan.mypressonline.com/calligraphy_practice_pages.pdfIn PDF document text
    • http://drovazvenigorod.ru/crosstour_action_camera_ct8500_manualzjx9i.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/ijidTib/jopatabolereneno.pdfIn PDF document text
    • http://idealicaitalia-official.site/layers_of_the_earth_worksheet_6th_grade2nzb4.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/widefewavunigemiti.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/society_the_basics_7th_editionxywso.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/iZXRiai/tepipunigexo.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/86805770648.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/FtgeSsI/miniclip_basketball_games_online_free.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/pudikuwugo.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/55COhg5/abbreviated_accounts_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tatudawo/jeoicja/goxomi.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/medicinal_importance_of_bitter_leaf.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/mark_twain_short_stories_summaries536h4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butadiviwev.rf.gd/primary_resources_non_chronological_reports.pdfIn PDF document text
    • http://zadotelap.epizy.com/xaxamajomururozajolumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02314244-ee19-4dee-9780-ffe70871086f/30814434205.pdfIn PDF document text
    • http://rewerikipij.rf.gd/loriwoverivixenuluvi.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/mechanical_behavior_of_materials_thomas_h_courtney_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6f4647-b33a-481a-90fb-4917aca4ac59/ruvejazowexopagopafozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce5ba6b-77ae-49ef-aacc-e1646e4cea6a/osi_7_layer_acronym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e9c2e5-d715-455f-b864-20cbcc30132b/stairway_to_heaven_tab_songsterr.pdfIn PDF document text
    • http://wimutojodi.rf.gd/how_much_money_do_interior_designers_make_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0cb772-b06d-4e56-91d7-2e63c219d1eb/gazusozekitimoz.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_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 6024 bytes
SHA-256: 765fe1dc788d33b6c5b1043fca382a814fb90cfd83b6e061003046bd6edd2b55
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 11100 bytes
SHA-256: 16017550195f4f25474ea1aa992959ec494aaabde0411fcbb43533e7b26af096