Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c9c133ee90bccc…

MALICIOUS

PDF

84.6 KB Created: 2021-03-21 06:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5bbdceb57dbe80721129001370406d10 SHA-1: 4308a2b1462ad420dc30491cfb178430e733837a SHA-256: 51c9c133ee90bccc2793068c83c8e1479517e3fd0376cf015ce645f46f938d4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=the+girl+who+owned+a+city+pdf+download PDF link annotation
    • http://gbo.guru/xeferowojifepaxonedizolwl0p7.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/bow_land_apko6ux2.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/hcqvgh0/16062272230.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/hjgfpv3/50035601249.pdfIn PDF document text
    • http://milanomoda-italy.website/harry_potter_8_movie_caste866h.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/nmV84hb/luwor.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/gdgjigg/business_management_pros_and_cons.pdfIn PDF document text
    • http://budonap.iblogger.org/85648169266.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/to_live_in_the_borderlands_means_you_literary_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/eSvzisF/flights_to_miami_from_houston_southwest.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/652757d4-7b2d-4ff6-acc4-b819b14dac1d/correlation_between_gdp_and_standard_of_living.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/minexoveregax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2e6483-b18c-417f-8cf3-1b5cd9491567/filivetevolodivudilaf.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/use_a_geometric_formula_to_evaluate_the_integral_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddcc936-046d-4f12-8dc2-88881a7e93c9/best_thing_to_get_at_bojangles_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/kidde_smoke_detector_saying_low_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbe54a9-9383-45f3-ada1-1d98b3734a1f/power_wheels_cadillac_escalade_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/mobazol.pdfIn PDF document text
    • http://mesuwepuru.epizy.com/dusonikewuvevebit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a368be40-1cd9-4fa1-9a3c-22d8ac7a7596/26519843223.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 5380 bytes
SHA-256: 4622c975b2f1dda95e9e28fd5aa4c4ba4f4d3df62772275928a211737f5ed8a8
font_01_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 10872 bytes
SHA-256: 05e5eab27f279e932f7a4bfac4f479390d1a87ee64f7d929d46d97b0dde89cb6

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