Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84dff16cd2a1772…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 13:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8dd349616b03ddb79c1e807b248c9bdc SHA-1: bf20ef55e1a263c6ef734ac8bbb86ebbc318c0b0 SHA-256: d84dff16cd2a1772527e5261a95362aff87a4deb1f84e58e9a84b5f37f5a9772
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, many pointing to PDF files on disposable or unknown hosts, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a link farm or phishing lure. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.wroclawmodelshow.pl/ckfinder/userfiles/files/xosif.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/62310877524.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/fasufigudivimoxu.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/59583320750.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210916133741.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/vezupalokiwujirigogular.pdfIn PDF document text
    • http://xenangheli.vn/public/files/namajunemiloti.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/25226601447.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/gejumelenosenewo.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/71319518370.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/36249b0cf44906c374dc79f8d24bb9f3/fejukazatuza.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/pavikex.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/46639837610.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/wapirazegekoxozaginotu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016d4d8138---fanoziwi.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/xudafinarebitinegeravela.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/59195584910.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/wixesivu.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/18164682959.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/tuzobotut.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/zafepe.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/36195811973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kindle+paperwhite+pdf+filesPDF 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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 18284 bytes
SHA-256: 3f8a4970251ab227e73e6628ec2caef3056fff281f6be3079f8a485b1adad238
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 10552 bytes
SHA-256: 407e5eeceb2ab904146928cb5fc8ed36910cfeb2f964b57566afb236cdf8c3cc
font_02_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.