Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8730b5543904c4a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 11:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b460999b581747cfc7d1947cffb6026 SHA-1: 56ed5765dc8705b9bc5d374823bf0be40c94ba4e SHA-256: a8730b5543904c4a9d1cff8a5e9d60eb7aca18f0ff1ae01747c100fd389f286f
126 Risk Score

Malware Insights

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

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://babamansurkurhuseyin.com/uni/yuklemeler/file/7817699617.pdf In PDF document text
    • http://whygzy.com/Media/Uploads/files/witotizemidu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/fuzuraviporofenirasa.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a60517665f---giwegekuwukol.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/17919096763.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/depoxoromawin.pdfIn PDF document text
    • http://scarpatti.com/files/poruzunemotuwot.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/26770261279.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210919022731542126u5rgjc1gg0m0.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/21805454313.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/11607301336.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/pipisatigajexigilifofo.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/49994171408.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/15182466418.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/nixativiwuxegopoz.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zanexogenijusof.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/42867878838.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/27565386556.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/gexujakorerelofogamima.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/26931292389.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/43535755582.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/38718851237.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/lowomigajufobigabobunob.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/matejetexadanebegilewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ios+14+barcode+scannerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 10348 bytes
SHA-256: 3f1fcecd6eccc17f7218a705c2b4a1d117cd067e90e4c2eebb6e41bf6a329700
font_02_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 17024 bytes
SHA-256: f60aa264cbe969eb622b2ce96b23a55161860fa5a24292df059482a94cfedf32

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