Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a145d3ccecb622…

MALICIOUS

PDF

73.8 KB Created: 2021-03-09 14:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 53600cbe99f9e21d18cf8e16a0b7f469 SHA-1: e1c5b27c76b00648d6a92f4a8e43c75a4d6d30aa SHA-256: 50a145d3ccecb62205b90d4e599ab209d5a7b7abf7cfbdadd457a175154fbac9
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 0.9996

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://xezojetit.ru/wix?keyword=weir+middle+school PDF link annotation
    • http://magazinrf.xyz/364604718065j3da.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/58235211766.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/ifQhdhe/astronaut_ice_cream_drops.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/afgdXSD/epic_games_launcher_customer_support.pdfIn PDF document text
    • http://lidzadva.xyz/954672297412tcyk.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/how_to_get_a_job_with_a_graphic_design_degree.pdfIn PDF document text
    • http://roskycnmx.com/angina_de_pecho_2017_ahaueomd.pdfIn PDF document text
    • http://sukutoxuwurif.mywebcommunity.org/73862453427.pdfIn PDF document text
    • http://mevixonur.mywebcommunity.org/how_to_use_weber_smokey_mountain_18.5_inch_smoker.pdfIn PDF document text
    • http://amandeepsadyora.com/most_played_tracks_on_spotify_ever8ep9y.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/weight_watchers_bluetooth_precision_electronic_scale_ww910a_review.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/54640630054oa0iy.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/my_whitfield_pellet_stove_troubleshooting.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/canadian_occupational_performance_measure_age.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/heil_furnace_unit_age.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rejusozutugagur.epizy.com/pajef.pdfIn PDF document text
    • http://gitodake.myartsonline.com/you_are_the_universe_experiencing_itself_quotes.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/do_you_have_to_pass_algebra_1_eoc_to_graduate.pdfIn PDF document text
    • http://junedujivoxoz.epizy.com/23194388504.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/17453234011.pdfIn PDF document text
    • http://rorolavosi.rf.gd/20546337953.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 4980 bytes
SHA-256: 52d7bfd7563bff17b4ee1f2fd7de6db1478440e936e2947a89c0ce906179a07a
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 10440 bytes
SHA-256: d283aee96b3c9f986583812f4a009ccb2a7783e3940434de53c8945de004c65c