Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5191d9074b1d06a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-21 05:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3cda0e2882142633f13f3c10ce353434 SHA-1: 75d3ba224e0174978849a9a657a7e4cb1cde7ecf SHA-256: b5191d9074b1d06aa7e03a95127d463d68f1812df982bcdd25b879d7135337bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://satisfytech.com/ck/upload/files/43864247722.pdf In PDF document text
    • http://condosworld.com/abisol1/userfiles/files/saxolomowifozit.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gazililerivawekana.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fubaludigedotinino.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/25016576480.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/81584766513.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/sureveso.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/18431879250.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/diwemefovodewemipuku.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jigafofosatawukafos.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb743d080---wefiditasewinuzitan.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///34560872274.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/75509883112.pdfIn PDF document text
    • http://ocung.net/img/files/tebumuliwukuzewejiras.pdfIn PDF document text
    • https://protrialse.eu/files/files/zulatofewagexi.pdfIn PDF document text
    • http://emannsltd.com/userfiles/57222520829.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/12095019871.pdfIn PDF document text
    • https://suruburi.net/mm/file/85820472786.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/546ac9efaa26ae08c64bd4940fa7c33b/41731053092.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/susasuwelewegim.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210911140340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kotlin+coding+interview+questionsPDF 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_off0000b8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 17652 bytes
SHA-256: 0faefe0ec897dfd06618c37565956d1b0a5fdef9b5b536161ed0f7da857e1161
font_02_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 10772 bytes
SHA-256: e0b1f62553c7a5b0eb73fe5d5855ed86c10ab54192add363b50eb703831a89c5

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