Malicious PDF — malware analysis report

Static analysis result for SHA-256 798401f7431366c4…

MALICIOUS

PDF

87.3 KB Created: 2021-09-13 19:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28a461af25af23b331afb9b86739ffe0 SHA-1: fd9ad559ab98a60f1da9f237e57c5188866b7013 SHA-256: 798401f7431366c41e3dbd849c47e45a6e303eb026a1579de6903f6b10650cc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were found embedded within the document, many of which are on disposable hosting and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The presence of embedded links and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pixomot.ru/uplcv?utm_term=drip+combos+in+fortnite PDF link annotation
    • http://rubensova16.cz/files/file/fegewapejuwogikabaxo.pdfIn PDF document text
    • http://artdental.hu/editor_up/fimeka.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/43465477327.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/besinagarofumuduw.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/lekegolufuwosa.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zaromipapi.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210909095915.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/vudirizakuzuma.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/41735786655.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/lemivimikedopawik.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64ab8acad---gaguvo.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/39757941943.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/puxuxaporoperoxewor.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/42094023367.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/fakolabakegewugijemogo.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/toguja.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/vivibugekij.pdfIn PDF document text
    • https://isleo.com/i_photos/file/28759108100.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/perawekuvogekeromegevitij.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/41659000835.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/supavifu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/logexexuxojeniwikufolib.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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 10572 bytes
SHA-256: d7e7073c932ade6cdace63b498b91eb9af2f8bc5b31fda5a31d0682f2a07aa37
font_02_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 19360 bytes
SHA-256: 6b20d4a54501ecad35475f924171b0054c416ae8ca4406d5ad242b9f878e123e

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