Malicious PDF — malware analysis report

Static analysis result for SHA-256 2234b21e90838603…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 08:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5733728cb6e49e5fecc91c6ed962a370 SHA-1: e74b5a7500292dc718320d76c808201a3bc3d882 SHA-256: 2234b21e90838603afcce081b05a0f894a3db7fa6835b9b9a604252121853c74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/123?utm_term=function+operations+worksheet+math+aids+answer+key PDF link annotation
    • http://pubomoxagu.22web.org/pasagotiwiloxadivedipane.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/g4Njdgc/spin_and_orbital_angular_momentum_of_electron.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/8Fjhchh/38683163329.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/aft2mgG/15147211746.pdfIn PDF document text
    • http://bovosidifusu.iblogger.org/lokurijozejefelawegisot.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/accounting_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/gdgdULC/vujobitami.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/liajhaM/80772788014.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/what_does_rsvp_by_a_certain_date_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satuwegalenez.epizy.com/9694595243.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_d54de0600dde47f29c245e26c740a8dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd48e745-d699-4c51-a6c6-4d285e417cb6/honeywell_th8000_unlock_screen.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_db08d189752347d58412d1d1132ef99a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07321f7-cda8-49e8-b051-6b34d253b5bc/52538079770.pdfIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_2010cb70b2564ac4a1ae00f4f78ea22a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/avaya_one_x_communicator_install_switches.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_a21a3b0b17ea4d70a24a8f898eec128a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9faa736-d3c8-4340-998f-aee3555a9117/chrono_trigger_remake_2020.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_4a19c90e2adb40e7933d27ebf7dcc30a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/035ea8c1-feef-4603-9e7d-f86dbea8ca71/dell_2001fp_monitor_specs.pdfIn PDF document text
    • http://malukofe.rf.gd/vegetarian_recipes_for_fast_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fba6a5d-9833-4d53-956e-90f73b183739/50341213247.pdfIn PDF document text
    • http://pajupevezujugut.atwebpages.com/gagivunitimu.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/fufebijaxudiwaxumipure.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/debekelu.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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 5492 bytes
SHA-256: b175afd3afb73fb003930e73b0a260bbf3dd6de69876a5fde7c016472f89269c
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 10684 bytes
SHA-256: 4697ef20857a0c60008bd98a6c9645c5a74122697d59f322b235d6aeaccbc787