Malicious PDF — malware analysis report

Static analysis result for SHA-256 d150998bf1b6250d…

MALICIOUS

PDF

70.7 KB Created: 2020-11-19 01:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f61df6fec5e4a7f46805bd5f6ad71574 SHA-1: ee16ec38da11e497a51d92bb0bb906e86a324b53 SHA-256: d150998bf1b6250de45bcf1c36bbde95173786073120439dd2cbb4572f12b889
214 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier. It contains a significant number of embedded URLs, with at least two pointing to known malicious redirector infrastructure or link farms. The document body, though heavily obfuscated, contains text related to 'step 2 worksheets pdf', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=aa+step+2+worksheets+pdf In PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/vexevekefe.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/jivegiva-wajitiwa.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/sakitivezilike.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/wozujama-vixukasugakarav-midenepu.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://s3.amazonaws.com/nijudow/ffxiv_eureka_pagos_guide_4.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c46273e-83f0-442a-83d2-a70639bfa00d/58376201890.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/mtg_best_plains_art.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/doxisawuxemepileg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a37abd57-fea4-458b-bf42-767902c55346/aprendizaje_basado_en_problemas_carl.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/primo_model_601088_water_cooler_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/gonasiforimazavevutodijij.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/namunurujabi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/able2extract_to_dwg_converter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe363f99-d743-42d5-83e3-c833f3edf5da/religions_of_the_ancient_world_dbq_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a71285a-842d-4a66-9eb0-56710329241c/50552779051.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/tabibisakidujosewopoliro.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/infant_santa_hats_bulk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 5008 bytes
SHA-256: 3fbbd6647c509fb39f77ecf8ddbd1e591c5f232b4b2b1d8dbbc489c046a7e67f
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10584 bytes
SHA-256: 96c4d0e9a26482c9d1aaeb40d13ce178abe11e28daf8c767dcead7192ead00cd
font_02_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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