Malicious PDF — malware analysis report

Static analysis result for SHA-256 18562cc2bdfa72e7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 21:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4aa6b2a4bec1185b30fbf80f78e34a5f SHA-1: d7477d3b63582f0ce685a3a65915dc9b900e5b4f SHA-256: 18562cc2bdfa72e7b74a8c8dcf62cd660de4fd6bfa9cf28494c1007ffa18dd59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to redirect users through a network of disposable hosting. ClamAV detection and ML classification further confirm the malicious nature of the file, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=king+all+star+tower+defense PDF link annotation
    • http://noithattamphuong.com/upload/files/76493012882.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/33028135443.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/xawerin.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/57128024609.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210904062159.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fikatewolujilofe.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/98292698032.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/vibasimibelo.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/79984661616.pdfIn PDF document text
    • http://nineslash.com/user_file/file/98418148344.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/21096258529.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vivizoxananisakiwusasopov.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dvegoghbfg8i8seu8jta1n6km5/degeseligonade.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/fodofe.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/5583291323.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/nobixovoxibaribuneteverud.pdfIn PDF document text
    • http://pb-book.com/user_file/file/xuzatodisowotawesojajip.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/dalosilolegi.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/boturefalawebejukiwewewe.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fitaxe.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1c0457b2a4d5039f46df3703ab1822ba/94707318663.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/naxorenasoxavasokeli.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://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_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 18368 bytes
SHA-256: 0b0900234357e053245249b6582743e9e88794b33557a96003647a3ca4a3ad9e
font_01_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 10608 bytes
SHA-256: f51b49c19a1b8331fe29119348db9bff37422740716533975fa31dd859c0352e
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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