Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5744a707cd79555…

MALICIOUS

PDF

78.7 KB Created: 2021-03-25 14:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c398be38b8ba9dc7f0d7ffd829965d5 SHA-1: d4f62a27e2d6f26be571792fc537d196893a6a5e SHA-256: a5744a707cd795557b1f0e9c51c5883a0c0966c5c9a4a74f45c8b3bec82cb784
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading further malware or phishing for credentials. The document body, though heavily corrupted, suggests a lure related to 'analytical reasoning questions'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • 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://golowaki.ru/wix?keyword=cat+analytical+reasoning+questions+and+answers+pdf
    • http://50offit.pro/polaris_ranger_570_midsize_manual5t30g.pdf
    • http://swiss-gear.store/kanavexatagugilipeicmu0.pdf
    • http://allerlo.xyz/4205384794lrdkn.pdf
    • http://adyga.site/zupisijolqh6n.pdf
    • http://50offstore.info/pegazakexuzidigesubizeve8b9.pdf
    • http://vigastlens.xyz/what_does_lick_mean_in_the_southlcikx.pdf
    • http://copyrightnotices-form.com/hockey_birthday_party_food_ideashq8dj.pdf
    • http://cmbmarketing.agency/the_master_key_system_quotesffdu5.pdf
    • http://dutov.org/which_is_the_best_water_softener_to_buy_uk92c9o.pdf
    • http://spencermcman.us/kefunapovofipuzopixldvmq.pdf
    • http://fullcreditreport.info/ao_escolar_en_el_extranjero_opiniones2b3wm.pdf
    • http://lebedugipul.mywebcommunity.org/ronuzidanuvaxix.pdf
    • http://carbags.site/transport_processes_and_separation_process_principles_solutions39xsy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52ab42f7-18d2-4f9e-a388-5d3099d420f6/was_the_night_before_christmas_poem_lyrics.pdf
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_759d3fb8c7094342b6c118ed87f42840.pdf?index=true
    • http://jokosen.atwebpages.com/jenis_blanching.pdf
    • https://uploads.strikinglycdn.com/files/62f19e06-07fe-4b89-b697-9cb280b02db4/regelotupewun.pdf
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_4803766af276413a953b43459e23579c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/64158928-66ce-4404-bbb6-646780165d68/jutaxerazobufiwovuxavu.pdf
    • http://posikin.myartsonline.com/how_many_carbs_are_in_a_wendys_chili.pdf
    • http://noroved.myartsonline.com/assembler_adobe.pdf
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_3b29ca3931824f228e2f1522e1032189.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b2a4adba-8db8-428f-b232-62299be2017e/zone_6_pittsburgh_police.pdf
    • https://uploads.strikinglycdn.com/files/7d096194-f2bc-421d-98b4-f9879325ac1f/area_and_perimeter_worksheets_grade_4.pdf
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_52f4e59bd7a84974b757036c76f8de0f.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_184cc789274c44e3a48c09c85980e196.pdf?index=true
    • 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_off0000f50a.bin
3b13cd5d85144c26f7e75b0debf84b35b6d72bb65de20c3e4b90ea5216bff1a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 5548 bytes
font_01_sfnt_off00010801.bin
b673fbf420ff6e8384e15c20ab30b12360799606eb96e2a71b82a27623f696c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 10716 bytes

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