Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dd450545945988…

MALICIOUS

PDF

77.5 KB Created: 2021-03-18 07:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d53333461a2fe2487b9b5104513a9427 SHA-1: 890151a8d2c2a53a41494c42d0d64ee77792a1fa SHA-256: 81dd450545945988395c69b20c8b8fad05cff691ae565ac27ed6f50589ae2d6c
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL points to a suspicious domain, likely used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick users into navigating to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zajinet.ru/award?keyword=symptoms+and+causes+of+depression+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375907/normal_6008978f4cf2b.pdfIn PDF document text
    • http://tilosag.mypressonline.com/xigonawosegirixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5fe0c3cb7ce99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fc71b75067e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415525/normal_5fd85701855fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_5fd0e4d475e2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5fd1f929a70cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379371/normal_5ff2bc1c21d1c.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/24428498320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_5fe7043021dbe.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/what_words_to_capitalize_in_a_title.pdfIn PDF document text
    • http://gujozulogisin.scienceontheweb.net/39043225951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fe2543ee2da8.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/56703022625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5ff03f7a50bfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff84865cc068.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/puziwemugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_6033bbf29a973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_604b15c61dde7.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/ziwuvijevo/14138979994.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/cosmic_sky_guide_minecraft.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/king_lear_act_1_important_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/zombie_catchers_cheat_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/41528512496.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/88098577182.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/89903706795.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_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 5472 bytes
SHA-256: c13fd5ee456a6b341d2140967af3b0f36ed6ce10a82a9417e70b5d0c34e4fb0c
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10508 bytes
SHA-256: 3105a7e69d384c85b9782cacb24b2eabd0686492d3caf11caf63634bfc577398

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