Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e0a33203c11fae…

MALICIOUS

PDF

79.5 KB Created: 2021-03-10 17:10:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbc5f7f184f5770a76d2c502ef52ee7b SHA-1: 2e9f0b9a2a9bbcad44ea178fbc4fb44cf1c25164 SHA-256: f4e0a33203c11faef65663fdd4072aabe498a3298249849c9ef385c6c7269a0d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware delivery attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. The document body, though heavily obfuscated, appears to be a lure related to a poem analysis, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://seumenha.ru/wix?keyword=we+wear+the+mask+poem+analysis+pdf
    • http://afracheat4.xyz/9026391942b3150.pdf
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5feb1b7047f61.pdf
    • http://jushq.club/14684098637vrguc.pdf
    • http://goldotzyv.ru/wodagomuviduxedorakzl23.pdf
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fe14f4508a6a.pdf
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5fed179f91377.pdf
    • http://biomaniix.website/51398758557kn0ox.pdf
    • https://cdn-cms.f-static.net/uploads/4473642/normal_6011e3ddcf85c.pdf
    • https://cdn-cms.f-static.net/uploads/4500001/normal_601e7e943890d.pdf
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5fc74d53d4978.pdf
    • https://cdn-cms.f-static.net/uploads/4382773/normal_6021642f79b13.pdf
    • https://static.s123-cdn-static.com/uploads/4366312/normal_600479126f042.pdf
    • https://static.s123-cdn-static.com/uploads/4494673/normal_5ff263f643af9.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_602b858ddb123.pdf
    • https://cdn-cms.f-static.net/uploads/4406208/normal_600f17eab35bc.pdf
    • https://cdn-cms.f-static.net/uploads/4421477/normal_60321edeeb9ef.pdf
    • https://cdn-cms.f-static.net/uploads/4406482/normal_600de4d85f38b.pdf
    • http://support-copyrighthelpservice-about.com/hp_laserjet_2100_series_pcl_6_driver_downloadz9ioj.pdf
    • https://cdn-cms.f-static.net/uploads/4393193/normal_6026ff3826ed5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vonusirukete/aflac_fax_cover_sheet.pdf
    • https://uploads.strikinglycdn.com/files/a9a1695d-eb06-4c2c-97bf-0bae0d64c561/26650181634.pdf
    • https://uploads.strikinglycdn.com/files/d4a3c90a-c167-48ec-8433-2977ad9c66ca/jijutanukakomedatemiwap.pdf
    • https://uploads.strikinglycdn.com/files/9a6e71a3-3798-4a02-bde1-49a91b1f2dd8/wafiwexukowozesetedu.pdf
    • https://s3.amazonaws.com/bepukuba/11763628297.pdf
    • https://uploads.strikinglycdn.com/files/916b8127-b265-42bb-bfec-2824832e1082/62280859615.pdf
    • https://uploads.strikinglycdn.com/files/67f651f4-e468-4b35-8349-7387ff3c8ade/amped_wireless_r10000_setup.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_off0000fa09.bin
9a73acc8adfc7ab24eb0de571e576cffc01f059a2c59ea887f940f14ed3fe82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 5552 bytes
font_01_sfnt_off00010cdf.bin
563f01a489e18616ab379f55fc43809d8e8fd59cb8f625335cb5887818e0ab80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 10320 bytes

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