Malicious PDF — malware analysis report

Static analysis result for SHA-256 903f63b5d90b1aff…

MALICIOUS

PDF

74.9 KB Created: 2021-03-23 12:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b43521334c7cbcdbf6ac4c071bba7eb2 SHA-1: 2ccf8ba18c6f0b1ef506899564079fc8f377c33b SHA-256: 903f63b5d90b1aff1305ad98dd8a4b133f90b1ce4f112c8108ba35e7d0da4aae
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 0.9997

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://jumiwimov.ru/award?keyword=bsci+audit+checklist+pdf PDF link annotation
    • http://tesekal.mygamesonline.org/cannons_guitar_chords.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/gudarodezatujuk_fazaduzaji.pdfIn PDF document text
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/sojigaborebode.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/context_based_access_control_systems_for_mobile_devices.pdfIn PDF document text
    • https://xafogijarusa.weebly.com/uploads/1/3/0/7/130739817/zusitogoj.pdfIn PDF document text
    • http://pupesotiv.22web.org/bise_sargodha_first_year_date_sheet.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/keto_diet_menu.pdfIn PDF document text
    • http://jotijitod.66ghz.com/59983580531.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/1985dd18.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/assure_model_lesson_plan.pdfIn PDF document text
    • https://vorapitejure.weebly.com/uploads/1/3/4/6/134605364/siwufome.pdfIn PDF document text
    • https://kigazapaxulet.weebly.com/uploads/1/3/0/7/130774964/4363876.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/86252725650.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizinamejukurep.rf.gd/reducible_to_homogeneous_differential_equation_examples.pdfIn PDF document text
    • http://guxajez.rf.gd/how_to_fix_my_frigidaire_washing_machine.pdfIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/encyclopedia_of_computer_science_mcqs.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/writing_self-assessment_essay.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/cummins_diesel_generator_troubleshooting_guide.pdfIn PDF document text
    • http://zemufobure.rf.gd/ferububatolagixokolijone.pdfIn PDF document text
    • http://bitines.myartsonline.com/jiterosukakakigije.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_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 5260 bytes
SHA-256: c0d92f4397f27c6f5410a714c43ea9142a943c577c0d15beaf3e3b2cc4e3c835
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10396 bytes
SHA-256: d955548e6863d82741e3c5fb738fa8c4d4b9fe164addda674dc13edac4247150

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