Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbe48ba54d14321…

MALICIOUS

PDF

88.5 KB Created: 2021-03-23 19:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f7913686ab0ce9467a292bbfd6520e5b SHA-1: eb69d3f12243f8b0c54b5db102962370bdc28173 SHA-256: ecbe48ba54d14321e7c84b7d20ee89456976201c4f509701bdd9444631832fc7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful 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
  • 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://dugedepap.ru/123?utm_term=senior+adviseur+informatiemanagement PDF link annotation
    • https://cdn.sqhk.co/nemazuwigumo/kjgsLSD/levi_s_x_star_wars_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/aicqshj/live_streaming_apps_free_download.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/3525921.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/vesoturebiro.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/hhajiic/timokodalagokifakejen.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/gjhid4G/brick_builder_lego_city_police.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_e736e60f57174b299fbc73a09be56742.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de027c51-07b2-48df-8540-512bf5722ff2/college_football_strength_and_conditioning_workouts.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_c67098e6365545ed80c67d6280a08f2f.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_047d6ae184df4c2ba1def591ae66fabc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0272c9-face-44da-b325-1e7fb8289ed9/baby_bjorn_bouncer_weight_settings.pdfIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_935565042cd24978b1b041d6c3cc0aca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aeba61b-ae8f-419e-afdf-e1735a18d823/molipezemibibaruw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0a1656-605f-4103-a746-b2fcecaf3faf/2897267142.pdfIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_dc686a7847b549ffaa77c117faf7616e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a00c332-d9eb-4dd1-b9c2-bd04a6eca582/91226466647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefd60bf-9da1-4e24-ba9b-779d5afb6f01/regunigowix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17805f38-0e8c-46eb-82fe-d94a631f5c9f/42133028717.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_e155d11faa784d889d75af683f7d70b3.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_a6c04aece82f486ea3af918f0e2749f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ccfeff-a96a-4582-9d05-9bbf3c9de32e/9354257348.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 5240 bytes
SHA-256: 2356ae0c14786531c9cc1384cfb6c622768dc6636733e9b64ee8cc03e795e369
font_01_sfnt_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 11012 bytes
SHA-256: c0aba8f993356cbdda7e8229c43220a57496915f8fdc2f45b929e3ac71d84ad8
font_02_sfnt_off00014637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14637 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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