Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd73d6d1963d690…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 15:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afd8b62f9819a5b9f23213e6b61866da SHA-1: 373a51ac404e4325dc2ecdd739883ad00ce70629 SHA-256: ebd73d6d1963d6901b14c3144f3c8bba2b9bf4f52ea1398d7c18ddf4b1a47777
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user. The numerous external links, many pointing to PDF files on different domains, indicate a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shop-exclusive.cz/userfiles/file/dazogozisegopus.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deedfea8d0---sipuvejidu.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/18093656462.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/fenibufatusapubulavi.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/76931444627.pdfIn PDF document text
    • http://travellerisland.com/files/9675707141.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/25217165258.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/67972758950.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wepaladukewaboz.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/53024037237.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/82346654020.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/73802283329.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/47547221062.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/zasafenokuxewotuloxolowin.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/jisokujupumo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wakibuvamupumazodinagi.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/rijufizewijaz.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bofupatelopubiseluluwaje.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/83654078018.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/rivuwuluzifovemuzos.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/dorev.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/12815524945.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/33511333198.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/bedinupolonuleruzuluvu.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210916031419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=subtitle+john+wick+3PDF 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_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 10692 bytes
SHA-256: a5927930a9223dfa74ec4b9ebcd948a6bd5f6377aac74a4cb464604e36e43568
font_02_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 19672 bytes
SHA-256: 4317099baa5c051b2044ff7c31a183ba654d3a4425f6e8ee5350f51f30346ea8