Malicious PDF — malware analysis report

Static analysis result for SHA-256 de716c37652da4f4…

MALICIOUS

PDF

72.6 KB Created: 2021-04-02 15:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8d08c5633cc7ac3eb25add8bfa8b2a9a SHA-1: a890a4897c1ded93c9597c1bb1031d92da52cb05 SHA-256: de716c37652da4f4cd4524f041b6744c3a385aef377ca5c15d4471faed47df3d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO poisoning or phishing. The primary URL, 'https://mezovovuduw.ru/wix?keyword=4th+grade+dolch+sight+words+worksheets', suggests a lure related to educational content to attract unsuspecting users. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=4th+grade+dolch+sight+words+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5fefdb7e221c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_6024f83f83cee.pdfIn PDF document text
    • https://birifukuko.weebly.com/uploads/1/3/1/4/131453348/c398cc5616c698.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/tizafinamevoxifaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_6043937a9a27a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_6000620ab372a.pdfIn PDF document text
    • https://famipitep.weebly.com/uploads/1/3/4/3/134355151/7926669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375891/normal_5fdd98462d0ca.pdfIn PDF document text
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/bopim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_603103a2c85ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376099/normal_5fde78547f855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fcacbbd7eaf3.pdfIn PDF document text
    • https://ginalanofogise.weebly.com/uploads/1/3/4/8/134886059/nefanorenatinupufux.pdfIn PDF document text
    • https://pewewikivu.weebly.com/uploads/1/3/5/3/135302390/9d3e399b07bf5c3.pdfIn PDF document text
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/325186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fde062a96268.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/xoferuzu/27979931058.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/39415787543.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/bonufilejivazojezi.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/nujijo.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gixefefi.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/80433660434.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/what_are_three_things_are_used_to_make_glucose_in_photosynthesis.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/21342685572.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/16212658201.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_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5352 bytes
SHA-256: 3c7c59ea0369c73c285033fc4dcdc4d1425087711fd160a573a5d673709e271c
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 10332 bytes
SHA-256: c765d96d27f93814ba0665c8cbf11ccc9255b6b06cfacfc15ce98c562586da6b

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