Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3bb8a2c90f0d73…

MALICIOUS

PDF

91.8 KB Created: 2021-03-26 04:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 580a64c5c511ad61e4d0fbabb5dc4e24 SHA-1: f05ad67544c16e4e8bf746bbe84977d3982e95c9 SHA-256: 6b3bb8a2c90f0d73dbec7579370a4d83fe50a2bc2998f2d2cb0db0c98556b8f6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=contagion+worksheet+answers
    • https://mipoxijal.weebly.com/uploads/1/3/4/7/134709746/7477184.pdf
    • https://takotifisusa.weebly.com/uploads/1/3/4/4/134499816/4967688.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/89ee9c8a-ca74-43a8-9aac-938d8e6fa5e4/tixegide.pdf
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_0ddd606b53e741f3b52bca8b678d5813.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_359adf11c2824c32964055b8bc02c4f8.pdf?index=true
    • https://s3.amazonaws.com/fupanabivote/38069870780.pdf
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_b80dbcef0e314fd786bdd466218183e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd42e9e7-d908-48ef-ac5e-ade9901e5bcc/hoover_pro_pet_carpet_cleaner.pdf
    • https://uploads.strikinglycdn.com/files/2d0627e5-6f13-49bc-a5f5-c2cb59e6645b/daviss_drug_guide_for_nurses_book.pdf
    • https://s3.amazonaws.com/bisute/podetugimavox.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_02a623bcedb14780a13b224627bce81d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aafa4f58-d124-4a12-8d11-0dff3743b360/invisible_fence_brand_transmitter_manual.pdf
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_1bcb4c3406fd40a58a991ac4b86bf110.pdf?index=true
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_94e0384145d6482e97c3ddfe49684123.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f75a109-c7e4-4ff6-b346-efa821677c5e/peak_backup_camera_installation.pdf
    • https://uploads.strikinglycdn.com/files/eab0ad73-2273-4a61-a81a-44dcd4bd0f01/23617436745.pdf
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_1c6bef9dbc9444868b50a6db929fa06f.pdf?index=true
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_bac853d8755d49d69e5918ee69de4c61.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012823.bin
9e76f9cb4b9c0128cb13457de1bff3aaed48fc31f35d09cfa01e31e1636f9dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 4976 bytes
font_01_sfnt_off0001391d.bin
c1e168f75d7588bdaf998131301dbd20c6382bfc513d9a23fa6b4cf5c1bece51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1391D 12760 bytes

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