Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a002f19868d1aa…

MALICIOUS

PDF

83.5 KB Created: 2021-03-25 01:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a0fde3256a0399969ccb1931e853b66c SHA-1: 7b2aea9de66a0d7fa4ab2f9f0b7bd67ca00ed7fc SHA-256: a5a002f19868d1aa0136761adc1c62a71db6d84f33800ac9ea558695d5921d3f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to distribute SEO-optimized PDFs. One of the primary external URIs, 'https://xajibur.ru/award?keyword=student+centered+learning+methods+pdf', is likely a lure to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=student+centered+learning+methods+pdf PDF link annotation
    • http://ch-redirect.icu/how_to_graph_velocity_time_graphm8bqi.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/70294124437.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/hp_deskjet_3050a_j611_scanner_not_working_windows_10.pdfIn PDF document text
    • http://funseeds.site/free_powerpoint_greeting_card_template1j22m.pdfIn PDF document text
    • http://bettermoneytips.com/chapati_roti_video57jvq.pdfIn PDF document text
    • http://russianpatentexpert.com/pdp_xbox_one_controller_chargerg8c7w.pdfIn PDF document text
    • http://tpdreport.com/fubanejuwongeq1.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/vunizi/9338834382.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/island_in_the_sun_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd0e997-c511-412c-9725-38ca72d41291/what_is_the_ptu_on_a_ford_explorer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4537ac03-a702-4fc7-8325-3bc78effb9e0/why_is_my_nespresso_machine_flashing_red_and_yellow.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/16958346238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e653b061-cc0b-48af-8942-85fb03fda4a8/matlab_plot3_color_gradient.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74762b9c-6245-4877-8822-88aa2e284522/zilujigurumitazefe.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/poemas_de_amor_alfonsina_storni.pdfIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_838d0ff961d343a29dfb5216a1d859ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxunu/56801730053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e6994d-e237-45b3-bad5-8a6afb95b4a7/bobcat_s650_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/vifoko.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/online_magazine_template_bootstrap.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_0e6e63cb9a4c46188724d2c43a0c4941.pdf?index=trueIn 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_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 5672 bytes
SHA-256: 316977e5d12afb7070ce47543970f0621f5698d76ed1c82f60c27fab1d82a289
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10852 bytes
SHA-256: 0d3bdd67c93bbff21f2352605e4d92b95fc42fb6be4a27bd08bf6a2acbeb1164

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