Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6971aa0ca25351…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 22:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 70d4dff62395bf69ec7483d455f7eb14 SHA-1: d81d6995d7b4270a370786f91087507616225120 SHA-256: da6971aa0ca2535193fbdd335080793a6a9a37599124be75ad6ec058c9352e6e
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik'. This, combined with the ML classifier and ClamAV detection, strongly indicates a malicious intent to redirect the user to a potentially harmful site. The document body, though heavily obfuscated, appears to contain text related to medical tests, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://crophysi.ru/strik?utm_term=what+does+an+elevated+crp+blood+test+mean In PDF document text
    • http://copyrightshelpscenters.com/how_to_install_a_draft_inducer_motorqi8tt.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/ijjibW4/70591492643.pdfIn PDF document text
    • http://texno3ua.com/what_is_the_distribution_of_tropical_rainforests_and_desertsxt9h0.pdfIn PDF document text
    • http://winclean-shop.space/letter_x_activity_worksheetsgjgps.pdfIn PDF document text
    • http://5coupons.info/kujivebososiwafodukifikir177h.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/recarga_facil_vivo_numerol5rby.pdfIn PDF document text
    • http://mosquito.codes/galejopoladevuzodmf2n1.pdfIn PDF document text
    • http://mybatut.store/animal_encyclopedia_in_hindi45gke.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/js3ggyL/74604626279.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/fufumuxadisatuj.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/i5f4idj/gorabumitopabefinow.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/XExw7xq/51344486648.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/iSvjfGB/lightyear_music_incorporated.pdfIn PDF document text
    • http://vipmanmarket.space/53253917306bnstm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/tetris_classic_brick_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/vitebopogujokafelomiga.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/garmin_vivofit_2_price_in_india.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_e5b4c0e3ba4744669aa61ebed3b69d35.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_22909711b62646d59042f0afc4480499.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/marlin_336_sc_35_rem_value.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_c3ca410ff0a840eeadd77780ccc2a0ee.pdf?index=trueIn PDF document text
    • http://satogitexuvo.myartsonline.com/52987025129.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/chestnut_tree_leaf_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/96657053369.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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5524 bytes
SHA-256: 44f841d97db9debb7bdb026d82773b206b0ec4da941b0a2f85b51fe63c72861d
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 11576 bytes
SHA-256: 4454622d789d12ebab2f3128ead9b4aeae81c6751b3c3a7a967b6abc77d7a874

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