Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0c805545e59b16…

MALICIOUS

PDF

83.3 KB Created: 2021-03-20 17:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af6ac632e04ba9a37146b4ff8460817c SHA-1: d4563a80c4bbd5fa97f3d453a222a2535a086c14 SHA-256: ba0c805545e59b1696af3ddff3dc767fee07a382e7f38c4cc9f28d8912b1db5c
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary focus on a URL that appears to be a lure for a job application, suggesting a phishing attack vector. The presence of multiple external URIs and a link farm heuristic further supports the malicious intent of directing users to potentially harmful content.

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 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://kuzutuzo.ru/strik?utm_term=solicitud+de+empleo+formato+word+para+rellenar+gratis PDF link annotation
    • http://lorem.space/jusadogaguboxas2icg2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_604e8d45f2d62.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/no_fear_the_tempest_act_3.pdfIn PDF document text
    • http://cleanup-sale.site/why_record_a_deed_of_trust5s4ne.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/dDhiWgh/cube_blast_3d.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/is_the_nook_tablet_worth_it.pdfIn PDF document text
    • http://dvestideyli.xyz/schwinn_ic3_indoor_cycling_bike_australia4oof3.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/vakirarewigilugupijinuxug.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/gcjdgj2/42586465814.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/cvLihih/buet_admission_information_2019-_20.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/icuhjgL/minecraft_game_download_for_pc.pdfIn PDF document text
    • http://mebets.xyz/pet_stores_open_near_me_that_sell_puppies0t4yb.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/how_to_use_bayer_contour_blood_glucose_meter991ex.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/c10omNq/72504986955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_5fe737d28ce46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bb52eaa8-b761-4d88-ab96-7a77ea812ad1/jandy_jxi_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e496c0-dabd-4cdf-ad29-a4269269ed91/which_is_better_to_eat_apple_or_orange.pdfIn PDF document text
    • http://bupalim.atwebpages.com/31793478739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6429445a-71b4-4750-9fd1-fa3e9e68de04/89803437946.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/tarizezavakif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c5c9dd-d28e-4eea-90aa-33f23ea1b1aa/13046209984.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 5552 bytes
SHA-256: 5e479f295509aa32a8519cc6c16022787e73241a1c42cc975bf78f7fcea91744
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 11528 bytes
SHA-256: 2b0ad8f167f4e1f07d5124a75a1727e48257cedd79e4c0f581705054d54bf109
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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