Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86fb3264f0477e5…

MALICIOUS

PDF

101.2 KB Created: 2021-03-17 06:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bc12aa4f1d99b00d2081d2de1f50fba SHA-1: ac2fcb3d2242ac8b21abfe27882d526d49a94fcb SHA-256: b86fb3264f0477e5c0caa18952ca73d0f7c815734a8409e552ee856f0978920f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=acheron+pdf+gratis
    • https://cdn-cms.f-static.net/uploads/4464053/normal_604fe060acda4.pdf
    • https://pelixenebedevo.weebly.com/uploads/1/3/4/3/134338689/dutuzoleperu_ridaberilewan_jezifab_wosuru.pdf
    • https://cdn-cms.f-static.net/uploads/4408352/normal_6046e4cc203e4.pdf
    • http://fuxakuzaporelu.iblogger.org/loxopo.pdf
    • http://disconto50.pro/lopabar9zx.pdf
    • http://nofawemew.iblogger.org/wuvaroxirukoki.pdf
    • http://mgacessoria.online/wewukulapevezuli24exw.pdf
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5ffa931db61fb.pdf
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/2549844.pdf
    • https://relelije.weebly.com/uploads/1/3/1/4/131438324/manoxonosajadinikodu.pdf
    • http://masalev.ru/zupuxenamajefujulao9seg.pdf
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/8009017.pdf
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/xewipiremig.pdf
    • https://wuruderow.weebly.com/uploads/1/3/5/3/135389815/3946374.pdf
    • http://bewelaxoludiw.22web.org/livre_anatomie_humaine_gratuit.pdf
    • https://xofudafitigo.weebly.com/uploads/1/3/5/3/135327781/5574062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_0f0906cc2c27461aaeb90ac33ec8d7cc.pdf?index=true
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_1808c89d52cd468daca4a99068c0e007.pdf?index=true
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_fd823432e02b4824935a74efa63cbd65.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_62dd14d095ea45f793ae4574752c13e3.pdf?index=true
    • http://batijobiso.epizy.com/74024736826.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_6aebb238c0f14ed6a249afe5ed174faf.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001407e.bin
5f579e4a594d774d38a07da513219686ab4abbb4667b7f6ffdf3d858bed92ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1407E 5160 bytes
font_01_sfnt_off000151fa.bin
abbfc2a59dbb687026f1d0957cf541fcd33d47f0a24434c6152d87b323b643f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151FA 11616 bytes
font_02_sfnt_off000177c9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177C9 4324 bytes

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