Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19aa19be79b3938…

MALICIOUS

PDF

79.3 KB Created: 2021-03-06 18:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 70fef3adbf454b76a63b931020e2dd80 SHA-1: 849e30df510fdd1d68554e8b7c302e1fa104eb87 SHA-256: e19aa19be79b39381da1ae5fcbdd480e78dffa70a8d2b0d7dc4c0407687e56e4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The document also functions as a link farm hosted on disposable domains, indicating a probable phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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 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.
  • 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://crophysi.ru/wix?keyword=8+social+studies+strands In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5fd6da3ba5cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_603cc25148385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_600f4258f23da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_601cb775ad2ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5fe18ca658e1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5ff0cd0ba0d91.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
    • http://najefitisefema.epizy.com/26486920977.pdfIn PDF document text
    • http://lamerowed.rf.gd/17365411358.pdfIn PDF document text
    • http://lewimidofi.epizy.com/8150459971.pdfIn PDF document text
    • http://xumidexasij.epizy.com/comptia_a_study_guide_220-_901.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/surfin_usa_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/how_to_determine_the_acceleration_due_to_gravity_using_a_simple_pendulum.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/sabufawapafaw.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/95281179412.pdfIn PDF document text
    • http://wedizakur.epizy.com/formal_letter_to_a_judge_template.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/dasivivido.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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 4912 bytes
SHA-256: 7b7443f51ca12522d208f9c1ead2da7fd9ad9a1dd539138ec2aaf0a69fb96091
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 10856 bytes
SHA-256: a3d70cfce3a3272594f0dd31033c7999a6e01d71c75cc5b14e687335a21a5d4d
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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