Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa39db18f4dae37…

MALICIOUS

PDF

72.8 KB Created: 2021-01-27 22:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 73e254899d67e7f4676262c092ff4553 SHA-1: 07f5d2780a9167fdf4e21476f59ec619b622013a SHA-256: aaa39db18f4dae3782532a583710c8802c87e0c7c0cc0612b3e2c91c8536bd36
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file that contains a large number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing. The embedded URLs suggest the primary goal is to redirect users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jottigo.ru/123?utm_term=community+health+worker+jobs+chicago PDF link annotation
    • http://ilmahli.com/status_video_download_tik_tok_mp39z9er.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/4284731.pdfIn PDF document text
    • https://vavurozuzen.weebly.com/uploads/1/3/1/0/131070500/kafadamemuwi-gopititaxa-magaliputivap.pdfIn PDF document text
    • https://pakowojazawari.weebly.com/uploads/1/3/0/7/130775116/xededaxoze_tukunilemisim.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/104788.pdfIn PDF document text
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/puzifuregesite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502493/normal_600369f570431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_600aad018586e.pdfIn PDF document text
    • https://texelerozalom.weebly.com/uploads/1/3/5/3/135314582/5907917.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/5c64d65dff558.pdfIn PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/3232158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidazeze/destiny_2_free_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/what_is_unconformity_in_geology.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/como_se_dice_buscar_informacion_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/licensed_clinical_social_worker_exam_study_guide.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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 5592 bytes
SHA-256: a7c95a30a0fef3ecec77847325be12ef76792c8059f475e10b502a83aa64d94d
font_01_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 10708 bytes
SHA-256: 4aaa3efa9d595b6543a7b8ea4edd336ec3070144919f741ac8fd3a43d80bd919

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