Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f6633879355ba5…

MALICIOUS

PDF

78.5 KB Created: 2021-04-17 10:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66368b0e008a173a7b632cc8cfeabc27 SHA-1: 775fabbd561004841a3af2c6c3750d108893d6d2 SHA-256: 26f6633879355ba5948bca4045bd5026f9e4b2c0dd4f7e1f5bc7e74993b975f5
104 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, one of which is `https://resalured.ru/strik?utm_term=how+to+fix+a+battery+doorbell`. The heuristic `SE_INVOICE_LURE` suggests the document content is designed as a lure, and the ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the lure-like content point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=how+to+fix+a+battery+doorbell
    • http://wujaxeniju.22web.org/nilifewuduxevawufododete.pdf
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/mutematizumekimanepi.pdf
    • https://static.s123-cdn-static.com/uploads/4495973/normal_600833d9d4c58.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6054f3c95e4cd.pdf
    • https://titerafutar.weebly.com/uploads/1/3/0/7/130775646/7193333.pdf
    • https://cdn-cms.f-static.net/uploads/4489429/normal_6066285dc800d.pdf
    • https://cdn-cms.f-static.net/uploads/4495042/normal_606b51786518a.pdf
    • https://cdn-cms.f-static.net/uploads/4423696/normal_60354149aff62.pdf
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/f7080e81bb16.pdf
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/3959143.pdf
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6057b7150820c.pdf
    • https://static.s123-cdn-static.com/uploads/4465262/normal_60039e125b496.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bc70c8db-f16c-472e-b107-ac68927ca670/xipefuso.pdf
    • http://supitemev.rf.gd/begeguwelim.pdf
    • https://s3.amazonaws.com/gajakelegeza/74985445669.pdf
    • http://rukuvaxev.rf.gd/augmented_reality_in_education_and_training.pdf
    • https://uploads.strikinglycdn.com/files/7c22a952-699c-4a1f-a442-ab12362b5104/can_i_bake_in_my_copper_chef_pan.pdf
    • https://uploads.strikinglycdn.com/files/0431305b-3939-432a-a71a-f08964d451a0/gixelivasojiro.pdf
    • https://s3.amazonaws.com/joterige/why_is_my_hp_photosmart_7525_not_printing_black.pdf
    • https://uploads.strikinglycdn.com/files/7fe0f18e-f6f1-43d7-ac30-92c0d19268fe/xasuw.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_off0000f5ac.bin
9f8d32ecc54467c023099bcddc9679e85c4b188a172411cf61f7d207e8768bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 5084 bytes
font_01_sfnt_off00010722.bin
5d24a7817eac8fcc896d6ad5ebc8566910978decee74176c17123f858971e9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 11056 bytes

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