Malicious PDF — malware analysis report

Static analysis result for SHA-256 263a4d79df06466e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 22:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a9290128940664d6b498c4a6508aa54 SHA-1: 724a787dfbd4b78ef7b955b1fa46441426480987 SHA-256: 263a4d79df06466e2fa4461aa06eca90cc92bf3143f7ba8b2c43475af1e75c89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=operations+management+russell+and+taylor+solutions+manual+pdf PDF link annotation
    • https://romalasergroup.com/userfiles/files/40988606306.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/somikepavipowow.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/sakixoxejutumegonikofopif.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/vefaxekam.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/gomolofiwutugawaworagej.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/nufuterofoki.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/mapizewiki.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630619860.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/54765200962.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/beliwixegepowev.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/duvaxog.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/29963719836.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f6cc1c96---lebim.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/75241438222.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/baxokin.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/xebikepedu.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/rivarita.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/xirarokeketexuse.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/rawiru.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/budiparimi.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/35324305362.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/12702637735.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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 18000 bytes
SHA-256: 4d24e4939e26c36d8a213cdf45d6229798ac62d689af325fa97dc21bdaff8a1a
font_01_sfnt_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 11080 bytes
SHA-256: 33ee51017b2ce5b163cb1ff0f647c1bc2bebabce1cfc0ec6460a18f5e5a549c1
font_02_sfnt_off000128a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.