Malicious PDF — malware analysis report

Static analysis result for SHA-256 975f482a78efc9f4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 06:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5e371178af678f6243965041b5c3ab8 SHA-1: 24e05ba8359bab582fd136ea40f930677699d0a6 SHA-256: 975f482a78efc9f4785095b5c0a2c26ea5c05bb48a658dae13f81401abfc54a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 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.
  • 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://dawnraytech.985.tw/data/file/userfiles/files/ponabividawapeginipe.pdf
    • http://capthepcongtrinh.com/uploads/news/files/nokogabeseluguwupow.pdf
    • https://novinfasteners.com/userfiles/file/kasivasanarobetipukiwip.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/27634008175.pdf
    • http://kiemdinhcan.com/Images_upload/files/61330588321.pdf
    • http://yuemeism.com/uploadfiles/files/rujajapelezewisak.pdf
    • http://learnersdigest.org/userfiles/file/juwukafizinokegu.pdf
    • http://tjjjsh.com/uploads/files/koporewisoxipedisijodotaw.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/89861585652.pdf
    • https://locktactyuma.com/userfiles/file/61301070933.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/pelida.pdf
    • https://deepex.hu/hirek/files/48263375662.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/nevobijuloxip.pdf
    • http://studiomanzella.com/userfiles/files/14833397975.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/wiwuxubizexar.pdf
    • http://capthepcongtrinh.com/uploads/news/files/55528450279.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/wixetejozofa.pdf
    • http://slhospital.com/upload/fckeditor/file/88181380631.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/22572456784.pdf
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/bodogewuli.pdf
    • http://emailreceptionist.net/userfiles/file/mitudasu.pdf
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/lisezokokujinisokuzuluwu.pdf
    • https://sindhuinvestment.com/ckfinder/userfiles/files/dopudigevadiwepilufewut.pdf
    • http://uforoi.com/app/webroot/uploads/files/sejejoposi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=this+is+not+your+phone+live+wallpaper
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC07D 16792 bytes
font_01_sfnt_off0000d88f.bin
87bda8d956eb039674374fc4c92ff335bff6766d8861a7f12b671f7f62bfb721		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 18124 bytes
font_02_sfnt_off000106dc.bin
af002ebf98bbbe394cd6b9bbd67ba86daadf20d8f4d8a8da2e623ee4819ca4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10680 bytes

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