Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aced5b98924b8a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 16:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dc6b8f730bd77f0094a28957b29a66da SHA-1: a5021738e3160d03337055c05641739fac1f2f99 SHA-256: 72aced5b98924b8ae4234db4dc54ce759cb24b673ec7f2e8e35c3838f56b920e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The PDF structure and the presence of JavaScript suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://ilyxrace.com/userfiles/files/jepenelokapuboxerulizegov.pdf In PDF document text
    • http://moiarchitekci.pl/pliki/file/varilofidal.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wizataxovajonexuzesozove.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/pojufufuw.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910170629126.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/libikanojuxuxixajej.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b1d0f5ff0a40089f3fc469a6a94e3a45/pilefasotuvekakolejabudo.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/mevisujexotolakopokotug.pdfIn PDF document text
    • http://cichanski.com/Upload/file/30117472863.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc019c0d64---birozegoxukete.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/41063107724.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901220056.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/73681730846.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/dawijelupese.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/zuxoposa.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/rekuzizotevojim.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zugoravuj.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/jojamejaweza.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/96092323662.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/galubo.pdfIn PDF document text
    • http://kco.su/userfiles/file/60812065507.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/nevoxirimala.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bajarejimenosulaxo.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/78757121853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+emerald+randomizer+emulatorPDF 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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 10496 bytes
SHA-256: ecf52b60d7eac97fb45bfee583b5a2b5872d2b93e809ec34c285e1133cd0c01d
font_01_sfnt_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 17772 bytes
SHA-256: 88278a91fd1ec469e420d297f7976812b3ebde76b4cec56a8a0695b8188d501d

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