Malicious PDF — malware analysis report

Static analysis result for SHA-256 174bb51823db00fd…

MALICIOUS

PDF

78.3 KB Created: 2021-05-27 15:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7d3d31eb941b707d9ec9730b7e08e5 SHA-1: db572af4161ede8b87e4c160647cce9b53de0914 SHA-256: 174bb51823db00fd715c11898a20d7b634fc97522e292bfbe351d0dbb097ff96
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier 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, suggests a lure related to educational content ('combining sentences worksheet multiple choice'). No scripts were extracted, but the presence of an external URI and the ML/AV detections strongly indicate a malicious intent.

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://resalured.ru/strik?utm_term=combining+sentences+worksheet+multiple+choice
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60210844bfa9c.pdf
    • https://cdn-cms.f-static.net/uploads/4487007/normal_602aa573a27c3.pdf
    • https://cdn-cms.f-static.net/uploads/4461219/normal_60492f0e0b239.pdf
    • https://cdn-cms.f-static.net/uploads/4387814/normal_600d7161d0d84.pdf
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fd5f62580ee4.pdf
    • https://cdn-cms.f-static.net/uploads/4479715/normal_602eae8e92299.pdf
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fca5f4923a6f.pdf
    • https://cdn-cms.f-static.net/uploads/4373998/normal_600b4318d9de4.pdf
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5ff4627f2316d.pdf
    • https://cdn-cms.f-static.net/uploads/4452626/normal_6039eb54459fe.pdf
    • https://cdn-cms.f-static.net/uploads/4491164/normal_5fd36d0ea2c4e.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_6039ee624b2af.pdf
    • https://cdn-cms.f-static.net/uploads/4506200/normal_604461166a44a.pdf
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600fea1ed9c85.pdf
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5fcbfa07ea454.pdf
    • https://static.s123-cdn-static.com/uploads/4443341/normal_5fed3b2025c79.pdf
    • https://cdn-cms.f-static.net/uploads/4381321/normal_6024fc082a6c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46282e83-ad98-41d8-97d8-9c28db2e7681/beretta_a300_outlander_semi-auto_shotgun_accessories.pdf
    • https://uploads.strikinglycdn.com/files/1a633454-5370-4627-ae14-7de1a115bf16/intercultural_communication_concepts.pdf
    • https://uploads.strikinglycdn.com/files/38201bd8-a03a-473a-a56e-d348d52faf3e/59910951644.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df06.bin
33613956111f238b12b0f10eeae38616c7d0eb91c428a30df1f393d145d5a2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 5340 bytes
font_01_sfnt_off0000f121.bin
9208ae186bb913e8abc944523378cce417a777859921c5c29b2a53df34a7291d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 10896 bytes
font_02_sfnt_off00011662.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16092 bytes

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