Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c320cd0cf3141c…

MALICIOUS

PDF

66.8 KB Created: 2020-11-10 23:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2201bda212e1d52860bd974d7e7abd24 SHA-1: 78f3cfaceb766d377e8e331f55e7aa5d1df79664 SHA-256: 76c320cd0cf3141cbb60ff8accd083686b5d81dbb915fd9c5f1ebaaffdedbbb4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains references to 'ballz game unblocked' and authoring information suggesting it's a crafted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?keyword=ballz+game+unblocked
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/jiwutasivox.pdf
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/de11a76085.pdf
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/2887901.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/gajusesudaxibew.pdf
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/bidizel.pdf
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fa5f1cc294f9.pdf
    • https://nigiseza.weebly.com/uploads/1/3/4/4/134462574/5147381.pdf
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5faad266a55b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbabc27c-256c-46f3-9a50-dae504dd9de3/97559642483.pdf
    • https://uploads.strikinglycdn.com/files/0a328aa6-6961-40b3-b454-e9ef5476b639/vubejitoxux.pdf
    • https://s3.amazonaws.com/zuxime/puxijaretawejulasokim.pdf
    • https://s3.amazonaws.com/gupuso/94400963730.pdf
    • https://uploads.strikinglycdn.com/files/e36fa487-b161-4ab7-b7dc-650e2af075cb/77262785308.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c685.bin
323aeb09a320caf5e48bd592177ab9e631608b1a66e608e7ce74d9b8ae091049		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 5288 bytes
font_01_sfnt_off0000d87c.bin
e3ac3d64f8944679095f8f395b999105f2ebb3e1ff7b4163b63439c20a2da7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 11652 bytes

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