Malicious PDF — malware analysis report

Static analysis result for SHA-256 283f367bbb4ed787…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 00:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 287d6a48e5752ed04f14ee0072a8380d SHA-1: 22693db9e8de04dbd3b79733e3260ade44166693 SHA-256: 283f367bbb4ed787e2dc8f0c4cdcf6d3ca8ec3fb7da5bb116f620dae1554a18b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The presence of a 'face chat hack apk download' URL suggests a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://uniradioweb.info/userfiles/files/misizobi.pdf In PDF document text
    • http://ecohost.ru/pics/images/file/sozaxeduzirexigakaw.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/tamigemizabumagevomiv.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/baxesovumal.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/52548400410.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/fopinijat.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/503893325.pdfIn PDF document text
    • http://pi-consulting.ch/download/sikigifalawoketolem.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27677621779.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/67340357107.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210906103422.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1959453be83f02b46f365bf1354878e8/28911064547.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/gavivot.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xufuvil.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/46166820033.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dijup.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/mufapi.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/repipuzesubo.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/kamosakamiji.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/jiramalef.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/70973888635.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/nozamaxetaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=face+chat+hack+apk+downloadPDF 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_off0000ba39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 17556 bytes
SHA-256: 1fd48e75e74807ce750d51996c35cb1f9d2504ebae8b96f1518d3a90116ab2c4
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10404 bytes
SHA-256: 85fd662c3503d4881532cb1e50ca683da7b6f442d19ed7e1bd9e068698a758d1

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