Malicious PDF — malware analysis report

Static analysis result for SHA-256 997477361f9099db…

MALICIOUS

PDF

74.4 KB Created: 2020-11-12 22:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0a53471f728d79ee6070d9a56ebb7b4a SHA-1: 808712c2a19d74aaec85750247418438538c9ed7 SHA-256: 997477361f9099db1f3428d64de32411d19d539aa9792f613acafd87f4b385c4
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that impersonates a Windows update notification, likely intended to trick the user into clicking it. No scripts were extracted, but the presence of the malicious URL and the phishing lure strongly indicate a social engineering attack.

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
  • 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://traffnew.ru/aws?utm_term=ultimi+aggiornamenti+windows+xp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f9fa56f98a70.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/42d438a6-40a3-4708-ba45-39ce6be6747b/yamhill_county_transit_routes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9719a21d-8db5-444e-bb8a-15f5e03a22ad/93899843285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7507c81-4742-452d-8ce2-17f46b701fc2/77350735004.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/ncert_chemistry_book_download_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/zozerafedaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/93838731967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d97ec81f-8bcc-498d-8593-1f4938a296b0/zazilugiparapegepuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/71101908604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12df225-d712-4cbe-a4fd-fef2db89f323/shortcut_maker_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/74240198183.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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 5432 bytes
SHA-256: 5fa919c87f9b6fc6396abaf5b7663addb958d2fd11da036ffb3145a24972a005
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 11148 bytes
SHA-256: e97d0cd1b2cc89329230803e10f119b7c038feb3aa4b63423958f94810387ae6