Malicious PDF — malware analysis report

Static analysis result for SHA-256 687355fe38766929…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 19:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5011ca75d2e14c89ed715926a14cbae6 SHA-1: 7e9ef390540ca3fd964aee011ee3f64b1a356ab8 SHA-256: 687355fe387669298e34c203a4b4c15583962e540f54e07ac50f5c5bff64fdd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which are to other PDF files on different domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://halaljones.com/uploads/files/71033409358.pdf In PDF document text
    • http://chugguwang.com/files/fckeditor/file/pupexasubigewiraz.pdfIn PDF document text
    • http://dytac.hk/userfiles/9050122579.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/17083309342.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/wawezerefikemafi.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/zisilubuwi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qbs0937rnt8vg5l307ab4mmpb8/kenikomofepumipelun.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/80105938848.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/debakaxu.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/xozesikijawevedidosoliw.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161340f22989a6---24921450605.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/7933739262.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/80031186392.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/menupipanitis.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/duvame.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/rizujonifenuwasaxom.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/50525733359.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/33374600035.pdfIn PDF document text
    • http://hrudolf.com/userfiles/nesijut.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/jimara.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/42035630458.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/lixujupipew.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/51405621695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+s20+vs+iphone+11+proPDF 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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 11352 bytes
SHA-256: 1b008cc6c7f5159e15f3f342ec3e19529d20f9e699a5cca617aac2fdc0b24b67
font_01_sfnt_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 17672 bytes
SHA-256: d21d652d1e861e9b0d81fc65b23f165a8fa81f44e979fc67d0f34b4725f122c6
font_02_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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