Malicious PDF — malware analysis report

Static analysis result for SHA-256 5954016fba4b1b46…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 17:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c6e52b62f2ff95de80081486ffd2997 SHA-1: 3588446fbb9467f95f139db369c1eef71e4b3b12 SHA-256: 5954016fba4b1b46daf02eb90760288f98b3bea9d8e64214d0b8cb46be6c5f83
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://inwebjor.ru/uplcv?utm_term=using+colons+and+semicolons+worksheet+answers PDF link annotation
    • https://tranthachcaodanang.com/uploads/image/files/12836802853.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/vaguf.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16136710d6e118---16534105454.pdfIn PDF document text
    • http://thedreams.cz/files/jabixevon.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/50864883619.pdfIn PDF document text
    • https://tmtteks.com/files/88231351501.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210902_12927DC9055A4894.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/6220469271.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/66165325065.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/jafegenazedewiduw.pdfIn PDF document text
    • http://arablift.net/userfiles/file/vedoj.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/85170233739.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/66699505518.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/jotexalujif.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/zawisufafesale.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/jegojunijej.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/fatekululotaloweniduzena.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/49713490276.pdfIn PDF document text
    • http://flirdining.com/uploads/files/58324154085.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/veduwarog.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/fenidafenasi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/vedoli.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/toxidefifikamonapew.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/jazoxexazilito.pdfIn PDF document text
    • http://duef.ru/public/file/bugupilepowawojefuzipe.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/62260424301.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_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 11000 bytes
SHA-256: 7e831edc6fe02da603f4f0455a25e83fb4a7b7ae57df5b842fba9cc97e06ed41
font_02_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 17828 bytes
SHA-256: cdf63920de03b33b39d602a6194859215137e762b5a20cdc0b6a057bebd7981d