Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb75eaa5eabb48c3…

MALICIOUS

PDF

74.1 KB Created: 2021-09-29 01:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb18ac783c09b6f6e7bb4ed834dc4bf2 SHA-1: c8e64275a96b8306a4dee05f1f982ec4c26d588a SHA-256: fb75eaa5eabb48c33c8ac1b01b800e2bacb28edd276020a50d45fdaf84525aa2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many pointing to potentially disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://sinostandards.net/upload/files/mivobimigiluvunaleresatox.pdf In PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/81464350482.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rajuwevawot.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161495dc212682---bewixabigijafujodefori.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zexikubujewu.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/pemafititod.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/17868441295.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-28-09-59-22-10.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rujetef.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/buvopojiwuwebobepagen.pdfIn PDF document text
    • http://decorstore.eu/upload/file/61429987601.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wemerapurinumazenokufotuv.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/toletofipozusupup.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/wexujanozedoxixa.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/51958940634.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/42044913259.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/98445923130.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///xinimogebixarimebodap.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/genepitifawadopeba.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/migamuw.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/62634310618.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/695040235.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161457425373f6---66255283589.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/monezubuludul.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/leduniterujigo.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/zepapelovekuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+video+streamingPDF 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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 17932 bytes
SHA-256: ef7b798a412e3b69cade34c7d8523a6e666f99d43cc66a365888f30c0b08fee1
font_01_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10592 bytes
SHA-256: 4024d16fa37d0107e0fbe3414d503bd15514b3431d5421646c479a39eedddf3b
font_02_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1