Malicious PDF — malware analysis report

Static analysis result for SHA-256 34abc9832624a26b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 09:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d5f0e16aeb868b23efa536a4f93c9a SHA-1: 036327ec97e51b8072b87484e91d7eeb8f193b9d SHA-256: 34abc9832624a26bc5b150126e97f7de10b968cc5fdea45da4f977e0a7fb3564
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 flagged as potentially malicious by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the presence of a link farm and external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://pumejinidekupi.22web.org/soccer_drills_for_five_year_olds.pdf
    • https://cdn.sqhk.co/vinogusi/vpicgjE/video_editor_glitch_video_effect_movie_maker_apk.pdf
    • http://mydenverneighborhoods.com/87431218260l20jv.pdf
    • http://fatunatet.getenjoyment.net/general_appropriations_act_2020_philippines.pdf
    • http://bisituz.sportsontheweb.net/classification_of_living_things.pdf
    • https://cdn-cms.f-static.net/uploads/4387706/normal_602e2e5e70554.pdf
    • http://copyright-supporthelp.com/78087237446rm1ti.pdf
    • http://parirapopuj.22web.org/avast_internet_security_trial_version_free.pdf
    • http://votixibutiro.medianewsonline.com/velibitot.pdf
    • https://cdn.sqhk.co/nobixapo/jeCEGIh/vex_robotics_programming.pdf
    • https://static.s123-cdn-static.com/uploads/4451018/normal_6001217a37610.pdf
    • http://siduwukalupi.22web.org/sakthi_shanmugaraja_amman_songs_mp4.pdf
    • https://cdn.sqhk.co/sogunixe/wjfjRge/nazokemazaxifir.pdf
    • http://businesslinecenter.com/firefly_2020_lineupda2vi.pdf
    • http://about-fb-support.com/red_and_blue_flag_with_suncdyl2.pdf
    • https://cdn-cms.f-static.net/uploads/4421215/normal_605fb29286da2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=how%20to%20help%20a%20cat%20with%20high%20anxiety
    • http://xibubew.epizy.com/82475705852.pdf
    • http://miduzusajaveg.rf.gd/kodaline_moving_on_piano_sheet_music.pdf
    • http://jizonizop.rf.gd/shall_i_compare_thee_to_a_summers_day_meaning_line_by_line.pdf
    • http://kelawezup.rf.gd/arterial_hypertension_articles.pdf
    • http://dudasuz.epizy.com/ditex.pdf
    • http://rupadulogoliwid.epizy.com/dura_dance_choreography.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e824.bin
8d11da5039d2b13ab75442681eb024d976bcfb1c24e18c1adb45c3384f90eca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 4932 bytes
font_01_sfnt_off0000f8f7.bin
306fb4aa8efba4e7a40f0a7d47b8bffb9331713457143e6859aa24ca27a0ae6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 10464 bytes
font_02_sfnt_off00011cc2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 4324 bytes

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