Malicious PDF — malware analysis report

Static analysis result for SHA-256 b857b1f5c4066869…

MALICIOUS

PDF

75.0 KB Created: 2020-12-28 21:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 48f9a6ad88c43600c802797ced125be4 SHA-1: 2322769a7549ffc5fb04b901085dca15159ed386 SHA-256: b857b1f5c406686998ad76c09d214ee98961a56321271eb4d1be131827772326
154 Risk Score

Malware Insights

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

The PDF contains an embedded link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, with the latter specifically identifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'foundation of abstract mathematics pdf'. The primary IOC is the malicious URL used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/aws?utm_term=foundation+of+abstract+mathematics+pdf In PDF document text
    • https://wepuporo.weebly.com/uploads/1/3/2/7/132741302/e319d5.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/lubutevifumob-sopojatefikamuj-vivawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fb4b6bd156c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c74f342-19cf-45f8-b5c8-1dd5a8bac2e0/bifikene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926c93d6-8e27-4965-8fad-0770ba11e262/goshen_local_schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6b6c12-744f-4111-8845-b1de6fa7a8a6/3917478123.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/liziwuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289dc077-08dd-4402-bf9a-80e1b81d48e1/nubunirumenupoxufezemog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f358c6d1-3842-4118-b7e9-b9d7a835f496/80979356021.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/bejejonomixufoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c5c921-82c4-499a-9527-c72f288a0871/5781933986.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/pifisewumedene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c918c8b-62e5-4064-9137-9c63a6876fa9/kijotewomezowugibesiso.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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 5460 bytes
SHA-256: 87ea341ba8cdf56e26079cfc0f861c6e3b44536f415735d8560b0b1370c13c66
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10776 bytes
SHA-256: 182f2c7e71249283bb1f4237ecba3ee7097b83417548990b8945494dc357fc40

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