Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e894fdaa96a64…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 06:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6445d9b101fa952c99a2e36ac34bbc95 SHA-1: 6d42f6b8db228e0c57a5a51d89f98552020a7ed9 SHA-256: b55e894fdaa96a646d7ff46b00211265277572283fb078dc897e2c2dd2395d4a
174 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous links to external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pascalparrot.com/uploads/assets/file/83600089328.pdf In PDF document text
    • https://petrovsky14.ru/docs/files/ziwutesogafefimokigi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ac2c24d18cfa2f63b4aeffee43250948/nevujuvatugabubos.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/55463806571.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/10535453003.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/1152180595.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/fagegoxomutezibasu.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xugonulomewutozexi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1239494d8---wuzefa.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/nemupezamire.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/gojusen.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/jininuzamubudixuro.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/8698744861.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/17582271307.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/vorisaxalifanosufaluxuna.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/nujodigaponojene.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/vuralupepafukij.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/bugozebadapoj.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/gumepot.pdfIn PDF document text
    • https://mkontroll.hu/File/73252500362.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/79027332460.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/viwum.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/5998702415.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/23892317725.pdfIn PDF document text
    • http://3sdent.com/upload/files/86718585781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tidal+hack+apkPDF 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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 9944 bytes
SHA-256: 7099579824ed48786d8b02f5bc8effbf71a288b5548f2fe2b2c3be342e9a5acc
font_01_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 18268 bytes
SHA-256: c2d6c428217c0aafb1b6eaa97c6be968f79cf03bfec3955e2d40097f184f1dad