Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab851057b29b3dd6…

MALICIOUS

PDF

71.0 KB Created: 2021-02-26 13:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a87eb00f526cc1d917f518f3ce28d99d SHA-1: dd816ac6733f784c013747865b99879ee793b857 SHA-256: ab851057b29b3dd658c533c4f065318de20aa7b7ea2cfa97ccb8ddf67e562703
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a video game, suggesting a spearphishing attachment attack vector.

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://golowaki.ru/strik?utm_term=how+to+play+all+factions+in+medieval+2+total+war PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369916/normal_600fd84ae41bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff69d6802d23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414847/normal_5fedb1dc6f11f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5fffd9333b762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5fdbd08996f97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fe07778bf16c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5feddfa337d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd8cdc7ef9ee.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/tapexiw/convert_kindle_to_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/disafemikumateb.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/angularjs_2_interview_questions_and_answers_experienced.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/dotifuselerulaxuga.pdfIn PDF document text
    • http://gamemogap.epizy.com/manualidades_con_cartones_de_huevos_vacios.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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 5648 bytes
SHA-256: e0a3fda70571c3d7ad142e2d5f7104d91c516f75947c8307e2ec8b160d34516d
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 11004 bytes
SHA-256: 0f6254e849ff03accc29cad75b1114f3d03dc7b146bfac7690e34cad7be93551

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