Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d41d06a5fdce761…

MALICIOUS

PDF

117.2 KB Created: 2021-04-27 17:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6749c49b13b77c3738187da310ba676f SHA-1: b1322573f0a0a2b96c32fc40baaf8aaf3b731dd8 SHA-256: 3d41d06a5fdce761d8f9958fa964166995d02d5d6db9c3628367f3c37a218d7f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 that leads to a suspicious domain, likely intended to host a phishing page or download further malware. The document body, though heavily obfuscated, appears to be related to the URL's query parameter, suggesting a social engineering pretext.

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://mezovuduw.ru/strik?utm_term=what+is+the+concept+of+social+contract+theory PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423148/normal_6060d0a3c8325.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/kudufumutozewinop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_602621465a850.pdfIn PDF document text
    • http://shop-you.xyz/jipojorosotititu3mxvn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fe6dcfe85db0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_601814677f5f5.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/xuvedegumu.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_605a4df97b566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_601ab6e3aed98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revudipepofaten.myartsonline.com/costing_methods_and_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/emerald_tablets_of_thoth_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/how_to_take_apart_a_t3_hair_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/uttarakhand_high_court_judgement_information.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/gulekem.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/vojodadotaj.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_off00018ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA4 5216 bytes
SHA-256: 220d543634c84451b0795f65f9a8bdf5f1ece23b49bc8c9d14cb3d9fdc658ac1
font_01_sfnt_off0001a075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A075 10856 bytes
SHA-256: f64a84ac135f7fd8f32ebe8f8ec7994a2c28affc74fb4730b5e3e55908155baf

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