Malicious PDF — malware analysis report

Static analysis result for SHA-256 8098cc78bd951476…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 04:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e72849876051411fb5b1071dfeafd5b SHA-1: c5d360188234347fe90f6b395d7376381efe2e3a SHA-256: 8098cc78bd951476b7dae48c9e38f99dbfaf81595a29658ed88ed63d1f613499
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It employs a common phishing lure, presenting itself as an image to trick users into clicking a link. The embedded JavaScript and numerous links to disposable domains suggest an attempt to download and execute a second-stage payload, likely a phishing page or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bjdfszwy.com/filespath/files/20210903175847.pdf In PDF document text
    • http://marthomaiticherukole.com/userfiles/file/setapemojozutamejuwifa.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/pobunewujenogag.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/nagudovozuruperad.pdfIn PDF document text
    • http://nineslash.com/user_file/file/tubovuf.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/kidelamoguganak.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/47951332387.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/lisezokokujinisokuzuluwu.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/8910518789.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/7rlufjnm0bc525hr88ctpttni2/geluvigotekovalaguw.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hd2vbhf08bqt0g12trsmebukg4/maxowebirobosigavufoguguz.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/runobozapasesatixele.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/wasuxewuruditomuwakusi.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/ludixenenetenadigonanonaj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wosug.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/bibijotubedenugot.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/faparazegazotegakebotup.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/mipavufanuzaguvutetabu.pdfIn PDF document text
    • https://laser123.com/geektic/files/53997967718.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/saxubesatovetuzasiguza.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/98152108720.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofiko.pdfIn PDF document text
    • https://gulamanis.com/contents/files/gadokedipovotuzipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+source+code+free+downloadPDF 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_off0000aeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB1 14100 bytes
SHA-256: e23a439be37d72b83974f156d2c1bdbd0715ecd69ffb6c6929ad1d59cc25549a
font_01_sfnt_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10540 bytes
SHA-256: 6111d5b05aaeef83e5271c16138d106a77214bd5aef90aa881b3fcc5e4292174

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