Malicious PDF — malware analysis report

Static analysis result for SHA-256 7551d20b1acf6d86…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 22:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6884e0bdcfae35965224e556c0808f33 SHA-1: 6cb375f1fc0ce5b71d4982b200a8ec5c6e9b78ff SHA-256: 7551d20b1acf6d86bc1eb2841079c233478537b1188658a5d9cd0a46ea3b6eac
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious and invisible links pointing to external domains, including one identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=indian+law+books+for+beginners PDF link annotation
    • http://jamotovoxut.mywebcommunity.org/printable_knot_tying_guide.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/zuvofidexazokipi.pdfIn PDF document text
    • http://cparta.moscow/worizokabesemamupotitusggn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_600d0eefe61a2.pdfIn PDF document text
    • http://instapriz24.online/wunefof5p3.pdfIn PDF document text
    • http://creditscorehelp.info/import_powerpoint_to_keynote_ipady5dho.pdfIn PDF document text
    • http://tvoy-ogorod.online/ottlite_13w_desk_lamp_with_magnifier4b93x.pdfIn PDF document text
    • http://creditreportfast.info/fejaxaxalokezizuwepl24s.pdfIn PDF document text
    • http://creditstar-kabinet.com/22667608342641g3.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/51569571677.pdfIn PDF document text
    • http://managerprogram.live/22781012165ekmbb.pdfIn PDF document text
    • http://prosale.company/26157105632mx89t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60384c1b144b0.pdfIn PDF document text
    • http://detonic-deutschland.website/92812119929e52oz.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/a5b0fb41-503d-4324-8d79-e0c12a5208eb/what_is_the_cheapest_dish_tv_plan.pdfIn PDF document text
    • http://xikisefux.epizy.com/fejinamivej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673d9e2a-608e-4446-98ae-e410abf9daa3/do_starbucks_employees_get_paid_well.pdfIn PDF document text
    • http://lutesugobomo.epizy.com/dadivijupa.pdfIn PDF document text
    • http://jedirolin.rf.gd/60529079514.pdfIn PDF document text
    • http://pogifovemujure.epizy.com/42790141284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963b3d9d-6bdf-4f39-a0c2-ccda0d96bbc7/how_to_compute_vif.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/zuvasitel.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_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 5308 bytes
SHA-256: ff069b0009efe2e003996f6d26e0783734ac1dcd2223cea370d491dc0fccf7a4
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 10840 bytes
SHA-256: 143b958e53a59c36b8e7adac8bfa7db1eb7adc0f977965af6b389d958061d15b

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