Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afab20df6796cc2…

MALICIOUS

PDF

80.1 KB Created: 2021-05-08 04:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c16d7e7c3d45d482940f0fac84da8769 SHA-1: 571060f0eab322480416cb5a952654079c860651 SHA-256: 4afab20df6796cc2fe90ca477532748ecf1a8961dda5778e7069b9552cb6872b
186 Risk Score

Malware Insights

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

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 0.9992

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=origami+instructions+hard PDF link annotation
    • https://cdn.sqhk.co/puxolika/eibHWOE/wololo_song_black_panther.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/dbjeA6Y/bu_bhopal_admission_form_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/dx28TVr/blue_moon_meaning_spirituality_2019.pdfIn PDF document text
    • http://nukobom.22web.org/filmywap_2018_punjabi_movie.pdfIn PDF document text
    • http://websecurer.tech/wufokatulusaba0zza.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/iihlieZ/67456470679.pdfIn PDF document text
    • http://successinyourlif.website/exploring_physical_anthropology_a_lab_manual_and_workbook_answersnzqx6.pdfIn PDF document text
    • http://umdtheatre.ru/arduino_uno_r3_board_pin_diagramy0sy3.pdfIn PDF document text
    • https://cdn.sqhk.co/dosovejozeb/gCKTBgp/body_shop_at_home_area_manager_salary_uk.pdfIn PDF document text
    • http://nudazemuxebabu.22web.org/16313545911.pdfIn PDF document text
    • http://zavulibalox.mypressonline.com/administracion_hotelera_libros.pdfIn PDF document text
    • http://favanitum.iblogger.org/biwojiwaxifo.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/political_candidate_profile.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/megelugik/zerurepup.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_f390125a3dc549b3b3ce34d12e3f4897.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_d51882fc7d4a4ee0ac6694eae1abca21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/international_journal_of_research__development_in_technology_and_management_science.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/xixalerabuxeba.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_8b64df32dda54a06ac52c2c955474fb5.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_9c0bae6ae568424f99bf6a88029cce08.pdf?index=trueIn PDF document text
    • http://fukasutatota.rf.gd/vuwukad.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/basic_commands_in_linux_with_examples.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/livaguzemibubevazogoguk.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_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 5348 bytes
SHA-256: a3737b498752853122029a73936f60f60ee3ce6c754754ce7134dfc62309e6a2
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 12832 bytes
SHA-256: b1fc051f37059c3e13021f8833372f372c09f0044a698faecaa0ab42be34a9e9