Malicious PDF — malware analysis report

Static analysis result for SHA-256 d658f9eb28de3ee8…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 13:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a41daf92df51313863754c9de432782 SHA-1: 8e0dc52deb04564df4e0d8b5e83d2e1e7dea1b99 SHA-256: d658f9eb28de3ee821010c1490a73c13a81d4a7cb4b35bef192d7db4b25af0f5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=blank+calendar+for+2019+and+2020
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/sumipebo.pdf
    • https://cdn.sqhk.co/wobuwozavenu/2hgieie/kaxavogegebapigolukepowo.pdf
    • http://numitoredewatam.iblogger.org/surutosativosivege.pdf
    • https://cdn.sqhk.co/jixuvepabu/w8jdnfm/sezodirakejudigapuno.pdf
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/fejejuxefowijapuk.pdf
    • https://cdn.sqhk.co/towitudamuga/FrhjZG4/light_mobile_presets_free.pdf
    • http://rulazix.iblogger.org/zijumafukote.pdf
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/riluret.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b3310bb-c9d3-4088-beb3-2822d7706547/does_directv_have_a_yule_log_channel_2019.pdf
    • https://uploads.strikinglycdn.com/files/8eda3134-9b3b-46ef-a88e-90cf6843cba8/33235351556.pdf
    • https://uploads.strikinglycdn.com/files/d3e4aff8-81f7-4f8a-8801-fe135c108931/sc_drivers_permit_test_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/bb3ebbe8-1baf-48af-86c4-5ed052dd49ab/77162059161.pdf
    • https://uploads.strikinglycdn.com/files/9511c5e3-03f3-48c8-9031-6c1dddec0d7d/21503835131.pdf
    • https://uploads.strikinglycdn.com/files/907c3782-2ec9-439f-83f8-70526c57152b/58664844257.pdf
    • http://kavotipuwevir.epizy.com/asbestos_awareness_certificate_template.pdf
    • https://uploads.strikinglycdn.com/files/8a2e3ebd-ea35-4874-a105-7ebb4675e69b/pitaja.pdf
    • https://uploads.strikinglycdn.com/files/65cd4e8f-6b71-4faf-8430-9e58980ea0f6/wayne_dalton_garage_door_opener_service.pdf
    • http://madojizekikozor.epizy.com/alzheimer_en_adulto_mayor.pdf
    • http://beranaja.epizy.com/26946739801.pdf
    • https://uploads.strikinglycdn.com/files/7a64b998-5f2c-4cbd-9c92-dd18ec218404/what_is_machine_elements.pdf
    • https://uploads.strikinglycdn.com/files/2d1f4473-8917-4a4b-b96e-6e630839afc6/club_car_precedent_light_kit_wiring_diagram.pdf
    • https://uploads.strikinglycdn.com/files/0e41e710-7a1e-47a2-9e3a-f8ebce7f742d/hp_officejet_j4680_all-in-one_printer_ink_cartridges.pdf
    • https://uploads.strikinglycdn.com/files/b4ddf89a-1746-43b8-96be-49534d77f22e/othello_act_1_jealousy_quotes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f755.bin
7fee41eab6e9613617edf8b4c7f7762fbad9d07910e711dd8c6b3e23f889a8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 5432 bytes
font_01_sfnt_off000109e7.bin
064640137b9ed65b28c70099ed0c5070adbac601d23657282dc04271c963929a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10976 bytes

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