Malicious PDF — malware analysis report

Static analysis result for SHA-256 e421f05aaad5df3c…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 00:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dc6a242cce19aaf1bdac4347cbbe9bc SHA-1: 6bd27ff052e2712704f7261fb2d6f875a39c32d8 SHA-256: e421f05aaad5df3c7e9833311a963fee08a5509f2824f46033174a4639139175
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which are flagged as suspicious or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JS suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xajibur.ru/wix?keyword=lics+icalp+2020
    • https://jajelawipazug.weebly.com/uploads/1/3/0/7/130739535/fa2ac842c7.pdf
    • https://ziduxibuzogegu.weebly.com/uploads/1/3/4/0/134012824/newibideled.pdf
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/8197718.pdf
    • http://com-login8.xyz/zusoza0ddzs.pdf
    • https://bedejoxinen.weebly.com/uploads/1/3/1/1/131163540/vesije.pdf
    • https://sutenemumam.weebly.com/uploads/1/3/5/3/135323571/rarizeso_xexazadiluzepe.pdf
    • https://static.s123-cdn-static.com/uploads/4465144/normal_600116d01ea91.pdf
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fc9394d42156.pdf
    • http://formblckr1.xyz/commando_2_movie_hd_filmywaphe4vl.pdf
    • http://stnold.com/xijorawqtt.pdf
    • https://ravuluzezufex.weebly.com/uploads/1/3/5/9/135956854/giwibetoruzat.pdf
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/xavojis_lowebanep_sivoruzuroneb_firubawofok.pdf
    • https://cdn.sqhk.co/namulofilox/Jijgcu7/48580272721.pdf
    • https://cdn.sqhk.co/jipogidara/hjhgj03/43751352200.pdf
    • https://static.s123-cdn-static.com/uploads/4460072/normal_5fde69f26b427.pdf
    • http://trokot-shtorki.online/47702028927g44tt.pdf
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/nolasuzadomafixazol.pdf
    • https://cdn-cms.f-static.net/uploads/4413705/normal_5fda3d41ba41e.pdf
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/suwulido.pdf
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/muxokemoxuxixulibira.pdf
    • http://evatopshop.xyz/my_book_of_memories_by_frederick_holbrookf8s0d.pdf
    • https://cdn.sqhk.co/repudodo/ejhhdgh/19124838764.pdf
    • https://cdn.sqhk.co/bapisolel/fH252V0/vetezegorozegedugomaxolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rujimidujek/powokabumi.pdf
    • https://s3.amazonaws.com/mixanaz/brenda_fassie_memeza_album.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed89.bin
1c3df4756aea89a7d1367ae811b0d660a3d7a66cd7e6686d8a3a1d09275d9304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 5044 bytes
font_01_sfnt_off0000fece.bin
188a96646c4fab365d9046fe04d1c9f8b37b2aa22e2bb2fb03c33b9103b755c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 11188 bytes

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