Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8115d6af106670…

MALICIOUS

PDF

69.0 KB Created: 2021-09-15 18:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f34824ba1da1f856b2c109bcd8cfec81 SHA-1: 84188b619728dd350243e99d011286fb8e321e38 SHA-256: 0c8115d6af106670b6fe79798dc53c4c31ba76212412508c937b163561472744
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically using a UTM term suggesting a lure for 'unlimited money and gold', pointing towards a phishing or scam campaign. The PDF structure and embedded links suggest it acts as a dropper or redirector to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://philabc.ru/uplcv?utm_term=unlimited+money+and+gold+in+kick+the+buddy PDF link annotation
    • http://bud-med.eu/userfiles/file/95520584048.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/37676978920.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/16214879916.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nujivunilivoke.pdfIn PDF document text
    • http://elitk.ru/_files/vorekabuwozibumifunepumix.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/40417656008.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/52810060622.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/dizulituxevafivuv.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sibiwo.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/daliduwusiwatu.pdfIn PDF document text
    • http://dominant.name/userfiles/file/61918647969.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/34041277406.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/43674364586.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/wabewafutidip.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/raguvo.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95708725527.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210912025932.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/sanajemipilezeguka.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/getixegufufujebe.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/pebenedemarobaxewem.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/46145030896.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/vukofenaxitanizi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/19f36269c3f67398bab98ba110974367/neludisosuwesepamat.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/kasite.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 14336 bytes
SHA-256: a8a23c058b1d137c6de76fbfd6719823a78007e135cfa3297c650e9427f0574b
font_02_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 11000 bytes
SHA-256: a880b82f3a48cb1f53b63d70cb1b21de8bbf6590cd9c2187a02a699744244798