Malicious PDF — malware analysis report

Static analysis result for SHA-256 5832bc3d0bb3b8b4…

MALICIOUS

PDF

72.1 KB Created: 2021-06-09 03:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e5ca4461c2ce29e94aebeecb17b437a1 SHA-1: 32df1d112ae06645dc1a772974f47227881bd009 SHA-256: 5832bc3d0bb3b8b4a847a83b402932e5f223f6f34b388b1e9eff5c0c4172171d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that redirects users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/pbw?utm_term=telugu+phrases+in+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386079/normal_600e40b823216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389365/normal_60082f29f186a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_606e13660d013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5ff96a8b106b1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379844/normal_60b20e17d066e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_60bd52c5b0cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_5fe9bb6d4fbf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_602f5e8e73d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_606b484e89d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_600c258e309be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486367/normal_603b6db60e41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_6015bcba5c497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_60232bad13159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_602d846aeac9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_605ffa6b57582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_606bd8f7ac922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxorunewive.pbworks.com/w/file/fetch/144901332/cod_mobile_ps4_controller_android.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144560424/10th_class_biology_notes_urdu_medium.pdfIn PDF document text
    • http://lodenapokot.pbworks.com/w/file/fetch/144626379/67535590173.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144689181/17212461433.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144816318/fijuketusenatadakojuv.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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 5252 bytes
SHA-256: 5125ac5a0510bbccb28680b76c636e7b1e1d1ddeca637723a4453468c49c48bc
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 10620 bytes
SHA-256: 8066f59ced94415ba3f9c2842a1dbdd879e08355beef6ac168dd5437b73a783a

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