Malicious PDF — malware analysis report

Static analysis result for SHA-256 748bb476d8ccaf41…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 11:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: daeb794d7a7ba2343e6af4825a910f62 SHA-1: 1a41d39597da51f2a72910c1c93c0ee2a3c59da5 SHA-256: 748bb476d8ccaf417acaf320d095a135f49f27473b2f37671b6083b3e4e02759
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to host numerous links to external sites, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://pirkitpadangas.lt/ckfinder/userfiles/files/tezozazixijedajefaj.pdf In PDF document text
    • http://aryajob.com/user_upload/file/35955507917.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/93025683976.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/10417151689.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/dosunazamorominiguvoxi.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/danemelujivezo.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/gilizigikegisolu.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/xubesonaporalogefu.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/85806045103.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/37499593256.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/5855538568.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/mikadaniwefobut.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/risobajamamipizebolefe.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/gedipezonosiziw.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/fe1ead92df9eb24eafb290f3350eac36/virepij.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/98289186053.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/medovigidozejaje.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/niwexezigufafutiwagex.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8556f637d60d8a48355e757c3c8a9cb1/38199080386.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/gixizenobedev.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210912002713.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/35783918736.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/94472253267.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/86141050852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=miui+12+snapchat+dark+modePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/riwiwobobisivog.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 11092 bytes
SHA-256: 829f6fa7cecfafed2eddf226e6947d41b3ebf430733fc52e3f754bdd03dda51f
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 18664 bytes
SHA-256: d70081850643719fdcff98d92eb04700fd1306a3e6d0583b6e2453ebb489bba7
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1