Malicious PDF — malware analysis report

Static analysis result for SHA-256 9055fa3ea0969c35…

MALICIOUS

PDF

74.1 KB Created: 2021-03-14 22:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4ec1fdd6e89be1247547c32ba3b68f90 SHA-1: 848d3f1490c8c6ba8e31b9f8e526113881a61a21 SHA-256: 9055fa3ea0969c351ffee5411a3a726b0d423f9663cfe061c2c618a514897dc3
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting and employing SEO-like keywords, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to educational materials.

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
  • 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://nipisod.ru/wix?keyword=similar+figures+ratios+and+proportions+worksheets PDF link annotation
    • https://tokegomobox.weebly.com/uploads/1/3/4/3/134314144/fogijemoj-vorot-rexijapisibolum.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/kufezituna-nipoxid-vuburi-xamejapapovodew.pdfIn PDF document text
    • https://cdn.sqhk.co/telapunojawu/cjjugiW/live_streaming_app_for_pc_free_download.pdfIn PDF document text
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/putitaxel.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/xovefunipus_divaje_megijeti.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/gcgjjaP/arab_empire_accomplishments.pdfIn PDF document text
    • https://xapeposatu.weebly.com/uploads/1/3/1/4/131437079/vunagunenorex.pdfIn PDF document text
    • http://metikinave.22web.org/scrivener_3_mac_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/gjhigf5/super_bomberman_online_r.pdfIn PDF document text
    • https://cdn.sqhk.co/rewanizotaj/hiibjgW/birds_pictures_names_and_information.pdfIn PDF document text
    • http://fojosug.iblogger.org/what_time_does_usps_deliver_international_packages.pdfIn PDF document text
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/xeleb_ronoja_xisedulubufazu.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/1787476.pdfIn PDF document text
    • https://cdn.sqhk.co/fusevatuboxa/hbDiche/biodegradation_and_bioremediation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawisanomo.epizy.com/how_to_put_oster_clippers_back_together.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/macroscopic_form_of_energy.pdfIn PDF document text
    • http://xilorevej.epizy.com/android_wear_os_2._0_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/conversation_allemand_franais.pdfIn PDF document text
    • http://komiguzuvare.rf.gd/62266685836.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/local_tour_guide_hanoi.pdfIn PDF document text
    • http://jezawirigi.epizy.com/sejel.pdfIn PDF document text
    • http://kesobikifa.epizy.com/dark_souls_3_darkmoon_covenant_guide.pdfIn PDF document text
    • http://nafopafilor.epizy.com/zalowokexiwokamepar.pdfIn PDF document text
    • http://ropisobe.epizy.com/easy_classical_piano_pieces_for_beginners.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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 5716 bytes
SHA-256: e7fb6d7ed9c3eb93e691b99c2233302dff059501293f4268adeb84f5f471aa28
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 10412 bytes
SHA-256: 431d6cb797ddf972590ba9e3bb769aa31cd0d05b2c7392de68c9c053636dc715

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