Malicious PDF — malware analysis report

Static analysis result for SHA-256 39aaae67dbdbdc0d…

MALICIOUS

PDF

72.7 KB Created: 2021-01-11 21:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4a4ac877821337e01cc740ec6b5d6971 SHA-1: 77fce5b8faefbd88e754f03e9a2cf096c4ecc818 SHA-256: 39aaae67dbdbdc0d3dc4ef0c7c4fd94f49c4447bec16f5fd414c4fef0050422e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URL point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=african+american+theatre+syllabus In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f8a4c8c7dcf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f8bdd911b9c2.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/sweet_empire_mod_apk_unlimited.pdfIn PDF document text
    • https://site-1166674.mozfiles.com/files/1166674/tefinotegilujavixoguvukil.pdfIn PDF document text
    • https://site-1195605.mozfiles.com/files/1195605/65955632047.pdfIn PDF document text
    • https://site-1168281.mozfiles.com/files/1168281/air_hockey_foosball_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392457/normal_5fc3e29b74c19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lebaxa/fusozus.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/open_letter_hamilton_mixtape_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/upside_down_loan_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/persepolis_all_chapter_summaries.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/24_hour_tire_service_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/worlds_strongest_woman.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/vuwukixokazobebaxuv.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_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5352 bytes
SHA-256: 08c42c6f450aaf2a390ca33ec31f49b4d783c005f67721f47b8fd2d83bfca083
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 11476 bytes
SHA-256: 81e0f2c64d30e80725d5d81a0b77ea2933ca15a40596e6a1cedd633fcb7e7c2f

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