Malicious PDF — malware analysis report

Static analysis result for SHA-256 4494b04d0715afc7…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 03:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae7b68948e5a0e6e6b1b24441167cab3 SHA-1: bf766b819b434c1dad1fc6c142fb1fb4c262d906 SHA-256: 4494b04d0715afc7b7524b0179cb9167b1c4cc941c15915414a03015a66ca9b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+unlock+phone+screen+lock PDF link annotation
    • https://jocafoto.com/fotos/file/mizome.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/10844295495.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tizenibofizorosepuxa.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/nubipojax.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/85140022699.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///80700368757.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/65834420210.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/rurel.pdfIn PDF document text
    • http://kleiberit.ru/files/file/fatesoduketigivogo.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bolazajax.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/fuxelozisifaxoziwoxirixu.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/divuni.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/zosopa.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/sumivurezepidedalu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144aca6dc03b---82864692608.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rarataximewerozanojuxu.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/milelalatokumu.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/98716218269.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909000743504431.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/gejedubekukosel.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wezuwibewo.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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 17300 bytes
SHA-256: 2ddc65c454335d5223a1b5e56cd3102cf669515ecf24f3140b288de3b7558d7c
font_01_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10488 bytes
SHA-256: 3c19b62285482171a8f452ae96cccf6b4e6fec708a6749e1584062628e7062dc

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