Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c104c705c54ed67…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 13:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 62693155881561968758bd5e4b87605e SHA-1: dfe395ca29e726cf18a9d745826cfc1592709f1c SHA-256: 0c104c705c54ed676c5a6db0d701e0aeb757da7062cf629b2f3291ee3db2feea
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs points to a URL that appears to be part of a phishing lure related to 'Dell premium support cost'. The presence of multiple Weebly and S3 bucket URLs, some of which are benign, suggests an attempt to blend malicious links with legitimate-looking ones. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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
  • 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://leonvi.ru/123?utm_term=dell+premium+support+cost PDF link annotation
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/risuporoxi.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/xanajur-nudanijapugek-bebufim-zadufakusedu.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/jjiagfR/jixixeganilobenavow.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/dzbjbha/glitter_desktop_wallpaper_backgrounds.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/diwiruketupam-moledefilatozex.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/8071dde.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ekhdjgo/4796776033.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/yc8iVhh/kemik.pdfIn PDF document text
    • https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/6518532.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/padosumifubobo/siwuzalurazarinemowope.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/51470196202.pdfIn PDF document text
    • http://runodeb.rf.gd/chase_checking_account_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/kulosesikivedaze.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/bye_bye_by_rjz_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/keens_curry_powder_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/zawez.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/calibre_file_converter_free.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/93850881397.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/jewel_chicken_wings_nutrition_information.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_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 4868 bytes
SHA-256: d3c949c0430add6fa45918d9bbf0a0f53cf1ba656b87912cd95640a9b20a37f9
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 9568 bytes
SHA-256: fdfc870b279f73743996f0ab4cd7bc6d03a629f3a1af500d811d17305d910fa5

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