Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b1814fc81558d1…

MALICIOUS

PDF

77.4 KB Created: 2021-02-11 14:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8c8cae9057a7ce56a8a933991215823f SHA-1: 14228a5d7209a4874da03c33f37939ad317208fc SHA-256: f0b1814fc81558d182fed8abb0e1697eb81a2a7b5cad74b7b11910d75d249250
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL being https://jottigo.ru/123?utm_term=harvard+guide+to+using+sources, suggesting a phishing or malware distribution campaign. The ClamAV detection further supports its classification as malicious.

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://jottigo.ru/123?utm_term=harvard+guide+to+using+sources PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5ffa98e62183a.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/7469e7ad8f.pdfIn PDF document text
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/kaweturabajomesomoli.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/kabootar_images_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5fc85fa54a602.pdfIn PDF document text
    • https://zavomejuguz.weebly.com/uploads/1/3/1/1/131163615/b799f.pdfIn PDF document text
    • http://dajumike.iblogger.org/kitumomekofim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_6010e7810c354.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/xalexojaxipud/tizotixilu.pdfIn PDF document text
    • http://ziwilud.epizy.com/xetaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/dozaxegejojorivuzadivefat.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/baidu_browser_for_pc_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/character_map_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/33493010437.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/16997655511.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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 5096 bytes
SHA-256: 87bcd5eb8ade4c53acaf52d139ebe137e5481e725fb0e9685048d7685cb9b43b
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11044 bytes
SHA-256: 8194bf92087f4f3c436a29eecf8ca423e6bcfa7a72533e20549dd55bea185c62

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