Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b603ad137ca1eee…

MALICIOUS

PDF

75.3 KB Created: 2021-04-08 21:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 257d63b62a6471b631280db06147a3cf SHA-1: d02bd79f6e417324d04b1b8bb88e4b5617abca12 SHA-256: 0b603ad137ca1eee95b2a9c028929e9178832df018a71a4fbb0b626948062a57
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=dungeons+and+dragons+eye+of+the+beholder+gba+espa%25C3%25B1ol PDF link annotation
    • http://pilebaketuvene.iblogger.org/celestamine_bula_anvisa.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/assassins_musical_script.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/jumetaxisabajesojinap.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/atomic_number_and_mass_number_of_first_30_elements.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/educational_research_quantitative_qualitative_and_mixed_approaches_sixth_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_2f845c9cc374479f8d355641417b436e.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_2094e79b432f4adf939ef65786c6635c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/73448952837.pdfIn PDF document text
    • http://patupafu.rf.gd/basic_electronics_by_b._l_theraja_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/65658524527.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/relef.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_77e1baa5769a44c79fc6993b0dd9552e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3182022-2aab-4e75-b3bb-5571728752b0/mepidarikusiwafatovibefo.pdfIn PDF document text
    • http://gonuwufif.epizy.com/preposition_of_direction_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca57df2-1fba-4106-a9b0-b135679d61c2/denon_avr_1513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b642c68-9753-44b5-8542-6f151a17a4c3/wowova.pdfIn PDF document text
    • http://purofix.epizy.com/directv_christmas_music_channels_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/17509441980.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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 5756 bytes
SHA-256: fe4aba2e2bb3aff29c46f0209ce51e3028251660964991bd134cd8043fccff99
font_01_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 11016 bytes
SHA-256: 50b2d644eb790f16ac2dc0aab1019239808efd641816f9083fdc08b350aad4f8

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