Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a16853083f18379…

MALICIOUS

PDF

76.5 KB Created: 2021-02-19 11:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f7319bf76259df9097331816134e6bbc SHA-1: 41dd724756027aba804b9a57be147d72a89eaec5 SHA-256: 9a16853083f18379c8feaa4d4100780e45613fec684bd54612a43488310f235f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect to phishing sites.

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 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://bologen.ru/wix?keyword=josh+garrels+at+the+table+meaning PDF link annotation
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/ruwutufe-jowovapotu-bazileremepumu.pdfIn PDF document text
    • http://lupaper.22web.org/216628673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_6001fb3d84148.pdfIn PDF document text
    • https://xunedoworevesa.weebly.com/uploads/1/3/1/1/131164322/5134592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370074/normal_6003986fe9c9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407069/normal_5ff7b6d7488c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_6018a4ece2785.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/e600c282fa1.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/bojigexor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_600f66783b58f.pdfIn PDF document text
    • http://vurenosul.22web.org/fivezuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasesepazoko.epizy.com/9258832106.pdfIn PDF document text
    • http://wosakev.epizy.com/semicolons_and_colons_worksheet.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/full_dictionary_copy_and_paste.pdfIn PDF document text
    • http://lemijafuw.epizy.com/jixavapisusofusavunidivis.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_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 5228 bytes
SHA-256: 1846ca85850cd52b4096c1fcbca8acc9f7724650e17172b5ee3a6754b8b30bef
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 10888 bytes
SHA-256: b6c37276ea358814d9bb0bd1b28acfb8b6f292226bf161ea1e90d48504a70b6f

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