Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77a49ba828d449e…

MALICIOUS

PDF

75.2 KB Created: 2021-02-10 03:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1315dfeca00b8b185a063328841bb08 SHA-1: c1359bb28619744606117c94ce1ab21ee72e1bc2 SHA-256: f77a49ba828d449e624a7319886dd416d983e16c71203f993096f3c577b31711
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=nice+sepsis+guidelines+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375907/normal_60002dc14914a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_6011d9ec1575b.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/domafavazeburi-karat-juwelelelafev-feteparasilatir.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugubobo/BbjjmWn/walt_disney_world_princess_castle_suite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480728/normal_5fee78e3e4caa.pdfIn PDF document text
    • https://waferipesor.weebly.com/uploads/1/3/5/3/135307907/noxawagifafek_mevetamurafeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5fe9ee731ea94.pdfIn PDF document text
    • http://powusonuruw.22web.org/free_background_banner_photoshop.pdfIn PDF document text
    • https://vatilevemuwaji.weebly.com/uploads/1/3/1/4/131453872/1103243.pdfIn PDF document text
    • https://kibapeti.weebly.com/uploads/1/3/4/5/134515129/sojetitevurazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ffd9e6080b7c.pdfIn PDF document text
    • http://zeraseb.66ghz.com/40003807923.pdfIn PDF document text
    • https://sanorasawuvut.weebly.com/uploads/1/3/0/7/130738762/38371.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/pagezin_poragiwexov_kofewev_rosugago.pdfIn PDF document text
    • http://antinomi.design/pojirazoxotipio0wj.pdfIn PDF document text
    • http://brandframeb.com/implement_boolean_function_using_multiplexeralkg2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://walagezumeg.epizy.com/banjara_samaj_video_gana.pdfIn PDF document text
    • http://meladuk.rf.gd/naruto_ultimate_ninja_blazing_pc.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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 4984 bytes
SHA-256: f10fd6ab80ba05e4e1bce7f0ee08fd5e619e690f9da825e4edd3a5e503dc0fc0
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10724 bytes
SHA-256: a44dcaf9f96a6754717fa75c58e5665482e98117f3b02e2826b80354dc78cfca

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