Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3617e4c80c9580…

MALICIOUS

PDF

80.2 KB Created: 2021-03-06 13:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b0acdad1436c01fc3094b1da3d996d8 SHA-1: d4307cb1970540c958c6984b8a50e9321190401d SHA-256: 7c3617e4c80c9580ba16d9a16b694292ee84163c1e4f19f881bc1cd1fdca0c72
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL being `https://ponafet.ru/strik?utm_term=carlos+cuauhtemoc+sanchez+la+fuerza+de+sheccid+frases`, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards a link farm tactic, likely to obfuscate the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ponafet.ru/strik?utm_term=carlos+cuauhtemoc+sanchez+la+fuerza+de+sheccid+frases PDF link annotation
    • http://sawemawe.mywebcommunity.org/dell_ultra_hd_4k_monitor_p2415q.pdfIn PDF document text
    • http://susurrus.space/press_kit_folder_templatet1f49.pdfIn PDF document text
    • http://accueilcmb.com/black_ice_cream_coneybw59.pdfIn PDF document text
    • http://basvuruizleme.online/pixel_art_animal_color_by_number_downloadwk2fr.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/how_much_do_foster_carers_make.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/world_map_with_country_names_and_capitals.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/pevidaledopu.pdfIn PDF document text
    • http://fimewot.xyz/94718321866hv0hc.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/what_time_era_was_pride_and_prejudice_set_in.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/is_there_going_to_be_a_dog_man_10.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/what_to_say_when_making_amends_aa.pdfIn PDF document text
    • http://twoup-viktoria.online/6471520640lqm8z.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/12778705031.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/bissell_cleanview_helix_filters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limewub/can_you_anonymously_report_someone_to_irs.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/kibegodilijisate.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/ministry_of_sound_clubbers_guide_2005_songs.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/breve_historia_de_los_estados_unidos.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/how_do_you_fix_timing_on_a_sewing_machine.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/windows_7_tutorial_free_download.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/fox_news_san_diego_covid.pdfIn PDF document text
    • http://lifobem.myartsonline.com/how_to_change_filter_on_hoover_windtunnel.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/50009420074.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/mutaciones_genticas_brca1_y_brca2.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/83400105931.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/how_to_calibrate_magic_chef_gas_oven.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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 5216 bytes
SHA-256: 85c799742101e4c86f89e06a6adb5e261149e6938f346ef7de5944be227229d8
font_01_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 11700 bytes
SHA-256: 72e4203715c6570a13367db6a78efdf2a00549fa02d6a96819f85a6cf4eaa45d