Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9dea4ab8997351…

MALICIOUS

PDF

73.2 KB Created: 2021-04-06 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 050a8981f9c5c638094db5e342ad1486 SHA-1: db2cd0044ea242e471d524a413fcc0f8b491536e SHA-256: 2b9dea4ab8997351d4f5a3900ec2e06b3a17d7ed9df48b9be6c9dd2c736b3562
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are designed to mimic search engine results for educational materials. The primary malicious URL identified is https://nipisod.ru/award?keyword=american+history+textbook+mcdougal+littell+pdf+chapter+2, which likely serves as a lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=american+history+textbook+mcdougal+littell+pdf+chapter+2
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5fecf90a49d3d.pdf
    • https://nimomobef.weebly.com/uploads/1/3/4/4/134458394/mofojo.pdf
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/4571289.pdf
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5fcb722ab8cca.pdf
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6066d3d6a8ebe.pdf
    • https://cdn-cms.f-static.net/uploads/4379969/normal_603bc806a1d08.pdf
    • https://static.s123-cdn-static.com/uploads/4473056/normal_60010e8a7a00d.pdf
    • https://kuwuxezito.weebly.com/uploads/1/3/6/0/136090431/c73e2c7.pdf
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/8785154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_e37c614334274785816c74dcdc170d00.pdf?index=true
    • https://s3.amazonaws.com/xalexojaxipud/23857583179.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_061ed0367ed741349898b97f531eabf7.pdf?index=true
    • https://s3.amazonaws.com/regovadeje/favidolafanituxosaromodim.pdf
    • https://s3.amazonaws.com/zubuwujoxom/65838698029.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_62bd7fd31826409c8e67004fec1fce55.pdf?index=true
    • https://f2182bdb-ca8e-4fe7-b379-f84e14eeb57e.filesusr.com/ugd/026bcc_9a64373f1ecd402f975e3f91c65fb152.pdf?index=true
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_4b631f1022654e0e9e7051eb5e051f23.pdf?index=true
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_8593262bfc7847b9888ba8db467ddbf9.pdf?index=true
    • https://s3.amazonaws.com/bexolamabad/i_love_you_3000.pdf
    • https://s3.amazonaws.com/wewuxuviwar/adobe_photoshop_cs_old_version_free.pdf
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_131b494db733499c8751347e647fed5d.pdf?index=true
    • https://s3.amazonaws.com/bolovopizonuki/26362591123.pdf
    • https://s3.amazonaws.com/gofiguj/canon_camera_sdk.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/newsletter_html_template_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b9.bin
9a03890664b32a184104f8c30277b572021d39d44aaa293d265233706bc1aba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B9 5944 bytes
font_01_sfnt_off0000e6c4.bin
896d4ea0bc1a75d05386bc67ad7f5f470747327675267bac906d718253a535cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10204 bytes
font_02_sfnt_off000109a4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 4324 bytes

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