Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ed613d72c54f6f…

MALICIOUS

PDF

71.6 KB Created: 2021-05-27 05:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2d61e8af2ea577895f9392bf155f9771 SHA-1: ae5c3b8a0b17baa96b2b7265089e089a3a035bc4 SHA-256: 22ed613d72c54f6f9e9e703c635616f86c48572ce9371bc7271ae98c9c29631d
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially garbled, contains text related to Instagram accounts, aligning with a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=c%25C3%25A1ch+x%25C3%25B3a+t%25C3%25A0i+kho%25E1%25BA%25A3n+instagram+b%25E1%25BA%25B1ng+%25C4%2591i%25E1%25BB%2587n+tho%25E1%25BA%25A1i PDF link annotation
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/tukoretokividut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_60556d5fd4ac7.pdfIn PDF document text
    • https://ditaziretuviki.weebly.com/uploads/1/3/0/8/130874055/6287372.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/jitipanepaxu_dedolexebik_roben.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/9519264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_604913d18554b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_60601ff06c6c9.pdfIn PDF document text
    • https://xesirizibolaz.weebly.com/uploads/1/3/4/4/134432563/60c80c53abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fe12c6f369db.pdfIn PDF document text
    • https://sitibopifug.weebly.com/uploads/1/3/0/7/130740553/8bdb9a.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/679b0a5b683f.pdfIn PDF document text
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/nekobujifunip.pdfIn PDF document text
    • https://sudivepa.weebly.com/uploads/1/3/5/3/135315425/9807422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_602f1bd83a139.pdfIn PDF document text
    • https://mufiwejugoj.weebly.com/uploads/1/3/4/3/134340856/8242949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fe9eed33ab65.pdfIn PDF document text
    • https://ritefebeg.weebly.com/uploads/1/3/5/3/135316582/jafikotuk_sivufuruwa.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/nuresot.pdfIn PDF document text
    • https://panujiwawavila.weebly.com/uploads/1/3/4/4/134457592/4996921.pdfIn PDF document text
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/eb66a2661383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6015a50f66ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_602f8a167f903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_60571c05c180f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 7068 bytes
SHA-256: 065b406b8f94d151ffe1fb74bca1f6e3b1f092d404f17c3c8e8fc731a2e00186
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 19568 bytes
SHA-256: b664a371fc69ec909ae5544d208712fadeda4d29e27e5dfcf54c6e14f778c1ed