Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b52f207ecd8e37…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 21:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3da18ba852e371c014b4df8f8122851c SHA-1: a64f84b6c88dfdecbc04f5d912523bd45a7978b1 SHA-256: 72b52f207ecd8e37e4538ea90c521179b48293fdd08b50b2b425610f1d459054
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic specifically flags it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://kuzutuzo.ru/wix?keyword=animal+cell+structure+and+function+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fd8564be4ce8.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/ahmad_musa_jibril.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/YhUgdGc/hockey_stick_size_chart_cm.pdfIn PDF document text
    • http://biomanix.best/315105038166wo61.pdfIn PDF document text
    • http://bigpleasure.ru/what_chemicals_do_salt_water_pools_need235lf.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/trane_air_conditioner_reset_button.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/I2ih8AL/sadozuzodaregadadupozol.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/the_adventures_of_tom_sawyer_illustrated.pdfIn PDF document text
    • http://center-san.ru/dividing_decimals_worksheet_5th_grade_with_answers39ed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5ff28c284c245.pdfIn PDF document text
    • http://predouche.xyz/how_do_i_identify_my_delta_shower_cartridgez1uwz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_600355cbc60bf.pdfIn PDF document text
    • http://roflan.site/16828860732f1z8g.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/e0e5a679-84d4-444c-bf30-42b7a3e73a6e/46402687679.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/ohio_statutory_durable_power_of_attorney_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f5ae4c-ba44-4da2-b107-762e564abbed/42208438366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60314e70-8154-4cf1-bfed-4e7ff501ff58/zetoxilewuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f01490-bbf0-48ce-aba7-9a4fd4ca3207/angel_care_baby_monitor_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10c0de0-0256-4ed0-8a43-f10b69275e67/yaesu_ft_450_manual_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/11383172502.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/axa_seguros_medicos_formatos.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/38701889771.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/73695495468.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/ambulance_man_badge_notes.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_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 5404 bytes
SHA-256: 662aefbc8a9ab944eeb8dbc8ac1bafece65007c0c1411eff3df63343ac9f8f5b
font_01_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 11616 bytes
SHA-256: d93e05c0de5308ca803513b05e80cc83f8a2957d8c6befc0f3b25116dcd56a1a

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