Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8de06c4fc1d8bc2…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 06:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3a1cabb420c39db1f10ce7ef1c992253 SHA-1: f7b36df1d22191b09771d6d6996731edc2ce02d0 SHA-256: f8de06c4fc1d8bc29be22032484cca494d714e1d92da2995cb3479328b6c4334
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic identified it as a link farm on disposable hosting, strongly suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to direct users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=un+curso+de+milagros+leccion+11 PDF link annotation
    • http://jigatinapa.22web.org/tamil_movie_kaththi_theme_music.pdfIn PDF document text
    • http://xuvivok.22web.org/clogging_cue_sheets_christmas_songs.pdfIn PDF document text
    • http://deluwotitawugo.iblogger.org/handwritten_cursive_font_free.pdfIn PDF document text
    • http://melifalafijuz.22web.org/how_to_install_submersible_fountain_pump.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/72183234743.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/19359441812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16fa9a85-7e4a-4969-ae97-66bed9e70a20/40336400821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4658d37-0e92-4cb8-9bde-e3d9eec2a283/viriraxilitirujazi.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2416555bf82846f4a934272288478ab8.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_7b6bcea3b6e84ecdb35152944e2d54a8.pdf?index=trueIn PDF document text
    • http://gadusevi.rf.gd/81997398048.pdfIn PDF document text
    • http://bavajozobe.epizy.com/73526172935.pdfIn PDF document text
    • http://nurifedalezonu.rf.gd/pijimuxufixasag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003d77e0-7fc0-49f4-89c1-6a1ad415e211/85183896129.pdfIn PDF document text
    • http://xobixipopesis.rf.gd/92330501863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93908257-2bbb-4010-81c7-b502ecaada61/julius_caesar_play_cassius_quotes.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_7a46dd7dae6e45778ac3540f07ba5301.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_998fcb151f5d4dd1a2bdea8905b76c05.pdf?index=trueIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_bc22674272f84ce2afb9d44805ec09a9.pdf?index=trueIn PDF document text
    • http://baxibajiduvedi.rf.gd/kumilataviwepofeten.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/galaxy_buds_spec_sheet.pdfIn PDF document text
    • http://lomipew.rf.gd/timibomiwujed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c593424a-ac76-4bb3-95f1-c82c9e6a7b5f/nasb_1995_vs_nasb_2020.pdfIn PDF document text
    • http://todidetiped.onlinewebshop.net/centripetal_force_problems_and_solutions.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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 5300 bytes
SHA-256: 885828919671038339a44edebe8574e3590849afc0025dd37cddda09ee011012
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 11796 bytes
SHA-256: 66558a0c49babe4b983e517b85fad1f97e7a95761ebe26df6f1654747859444b