Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ad41095064507f…

MALICIOUS

PDF

72.7 KB Created: 2021-03-15 08:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1228c8b2c9a827b6aadd17301c4d3657 SHA-1: 61735853951cf5d87a332991c0c8ffd439d0ce5f SHA-256: f9ad41095064507fa0561c718ac10df6178bc78c7006611823fc898b9c49e58e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of seemingly unrelated ones.

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://ponafet.ru/wix?keyword=sterilite+5+drawer+tower+black PDF link annotation
    • http://vuzetasavuxoso.mygamesonline.org/welolegud.pdfIn PDF document text
    • http://bluetea.space/986011955734o49z.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/44527130888.pdfIn PDF document text
    • http://get3creditscores.info/calendar_app_for_android_and_windowsmf4kx.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/lujat.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/vavib-sajixaj-vokuwaj-kurutofa.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://uploads.strikinglycdn.com/files/2e9dc9da-e480-481d-9b2f-96d059dae7a6/letovosajinobo.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_2e2854fa95064f258248349e7037ff52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/golds_gym_trainer_410_treadmill_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/kebegefujefomaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b3a7c0-b20a-46d0-83ff-5b6aacd2fa23/69225075284.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/1001_questions_mcat_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5acd9dd9-e263-4edd-9fa5-88cc9ef2218d/kenmore_microwave_manual_model_721.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_0e83410c6fe2498eafe9ae8d4a228682.pdf?index=trueIn 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 4960 bytes
SHA-256: 55270fd89a0da0d406da19631a7a10153c5b22e4c026fd64054f934933427b7d
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 10112 bytes
SHA-256: 1444609d68df61769d5c8c1975ef9fac5c7c076240c4fbfba2ac7205e053190c
font_02_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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