Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59a87fcc221ce77…

MALICIOUS

PDF

85.3 KB Created: 2021-04-15 19:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 908ec5f63c30f6304b48dc0d94ce2da9 SHA-1: 204cd72c7e362acdd940187a07d8f30099295e01 SHA-256: b59a87fcc221ce77214d1087cad85fe57e9d52bec96efc62ada4efd5b4068e4a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The presence of a URL with a 'blender 2.8 tutorial pdf' UTM term indicates a lure to attract users interested in specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=blender+2.8+tutorial+pdf PDF link annotation
    • http://dudoxanudito.scienceontheweb.net/dadaterigovitajafobufuxuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5fcad73055e08.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/ijjhXjc/lapowizesolevuxuf.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/hgdWgid/86491857321.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/ghgeCjh/63530830447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5fec25b465b64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384649/normal_5fefdfc55af66.pdfIn PDF document text
    • https://cdn.sqhk.co/derixosu/cxieA2i/the_pirate_caribbean_hunt_buy_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_604132c9ca2d4.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/sample_answers_for_interview_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_6064ab6719af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_603e61516aee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_603e368c82ea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_5cebe59b80c64ece83a8d1ab3d81df9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/379d2201-57a6-4679-848f-89b54ec46e21/movuninakigepikuboxojo.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_83adb9e826e8402c82948f8dc5bfb61d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64184d9e-8a1a-40f9-86f5-cb21b4ae5310/1465118529.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_becad8aef13b4f678a1363632ecf84b9.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_490823ee97b849e3b008fede1bb41b69.pdf?index=trueIn 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
    • 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_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 5264 bytes
SHA-256: f7f840494eeeed411bacc475de856993172052badd499341736928919493aab0
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 10380 bytes
SHA-256: 041a4c315beb9476ab95a8a555e892152b523a3ad265b7977ed4e6248e33927e
font_02_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953