Malicious PDF — malware analysis report

Static analysis result for SHA-256 94acfee1a50beb60…

MALICIOUS

PDF

113.2 KB Created: 2021-06-11 07:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 68dbbc25161a0834bb6f97831c0c3ddb SHA-1: c845a6d5f9e4434608feb4ae16010195fc430ab6 SHA-256: 94acfee1a50beb60cf7262b3dbb77a6c0bd08508a4daf620e5f49adaca295b4e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

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://druttle.ru/123?utm_term=significado+de+los+meses+hebreos+pdf PDF link annotation
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/5a320adf17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6017290693ca9.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/5535358.pdfIn PDF document text
    • https://nivosuvadifo.weebly.com/uploads/1/3/5/3/135384950/f603812dc7c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_606da1d4c783c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444096/normal_5ff771506bcb5.pdfIn PDF document text
    • https://ziwarafe.weebly.com/uploads/1/3/4/3/134306838/94b9b6a00.pdfIn PDF document text
    • https://gowokijisamupu.weebly.com/uploads/1/3/4/4/134438950/8260321.pdfIn PDF document text
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/3342926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jukozatixul.pbworks.com/w/file/fetch/144872154/gta_5_apk_grand_theft_auto_5_for_android_free_download_-_dwgamez.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144806130/57707267398.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144986847/online_gif_to_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3943fc1a-1e71-4ef8-8e67-21be7b3462b2/492570600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8fbc5c-f66c-460a-ba25-4822c54b2ac4/49004288281.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144713094/vanagipugiboxejimatulo.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/como_fazer_carto_de_credito_da_caixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96a49db-022a-4636-b02c-2ccdb8954bcf/why_is_my_computer_not_charging_while_plugged_in.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/14299028367.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_off00016e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E01 5812 bytes
SHA-256: 55996a8567a7a8ea038c4c7a7a06a41b1f52535ab9347def970d27156f74a30e
font_01_sfnt_off000181a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A1 17020 bytes
SHA-256: ccb54232fbcae5f8ff3fa2cbc7ecf7e9a57948a974e102af558b848df0974e33

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