Malicious PDF — malware analysis report

Static analysis result for SHA-256 f287db9a71430760…

MALICIOUS

PDF

77.6 KB Created: 2020-11-13 15:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: de180ec78f31005a0253894417b892df SHA-1: 9199093f137fedaffb88734e5064b458cf5e98d6 SHA-256: f287db9a714307606197078cd7d42cc9cc2233dfa708228709a8e2cd85ac1e34
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=photoshop+magazine+layout+template+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5f9ed528d7b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f8ae92500f44.pdfIn PDF document text
    • https://porimejonawi.weebly.com/uploads/1/3/4/3/134368737/99e6575a185ee.pdfIn PDF document text
    • https://lixabexuraluna.weebly.com/uploads/1/3/4/2/134234562/tuxidisuxek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5faba27d17c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f879fd35cedd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a5273a-a089-47e0-a819-e9e74fdd13cb/7270140931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac07404a-0db1-4165-a900-66ca6e069d7a/basic_math_in_javascript_codehs_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcad99b1-33df-42a1-a722-89aaa80c7524/pagugolodifaduvina.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/gegij.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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 5468 bytes
SHA-256: 432c34e87fd86ec6ffbc3d7237a068ec4adb78131565f80564e0885a0733e337
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 12760 bytes
SHA-256: 7ff9ee6d3c7d19132872849e6c918215ab63edc998961f2209c2797474ed3e47