Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0cef9af9770c3c…

MALICIOUS

PDF

71.4 KB Created: 2021-03-21 09:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4387d00e2bbcd5ef4d36a2c465629a88 SHA-1: 2039bd0f9dfefaba6f18b06fec953c41b24acd08 SHA-256: cd0cef9af9770c3c43c7b33dfa79395c096b36af0628f4570de144846cd52d1b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to potentially malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to leverage SEO tactics for malicious redirection. While no scripts were explicitly extracted, the nature of the link farm and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/123?utm_term=straumann+impression+coping+guide PDF link annotation
    • https://cdn.sqhk.co/fuvopone/bqiihil/moon_patrol_online_original.pdfIn PDF document text
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/fe860304dee.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/azYjgjd/wekufewu.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/fe5d079bf9c10c9.pdfIn PDF document text
    • https://felogenapugiro.weebly.com/uploads/1/3/5/3/135327705/zibuwubuwuk.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/toxadij_pezezegifuperi_pogoru.pdfIn PDF document text
    • https://ramilelajebow.weebly.com/uploads/1/3/4/6/134647205/mudaja.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/2350919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_1e780e55bf7b46d0b44d7b822dfbd8c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54fe3ed-f0e1-4c51-b3b9-5d85538195a5/wixurivejolanuxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86daaaef-4ef0-4646-9164-c4027b8665e8/metro_2033_redux_chapter_7_bug.pdfIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_bf24ab51b2fa4d84949c3063f3646a1b.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_96fc5003389f4d6380e112bf7f2d48d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acddccb8-68a7-4236-b93a-2e024a5e51da/2005_honda_rancher_350_carburetor_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c835cf1-d359-4659-8c4f-370fc87496fd/war_horse_trailer_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fcaccf-bc2f-4fa3-8342-bea67e2e3955/why_is_agenda_setting_important_in_public_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceab8757-57d7-44b1-873d-9089de8b4914/blank_venn_diagram_template_3_circles.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_8d8321b7f504466fa0a8fb4696fb4c0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04280232-d3d8-4823-864d-997de11b564c/jazozofamofar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3382bbf2-95ec-4b2e-9611-f5a851508e4b/how_to_determine_the_age_of_sedimentary_rocks.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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 5464 bytes
SHA-256: 5df4f2b21aa6e1e6a206d6aa4d6d582100c6cbe53fc5586f913b42f2b8417b27
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10952 bytes
SHA-256: 4cd7d4cba9ec97ca4345310a88b48e93228bf155eaaa163fb79445334a29639f