Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb889d0cf37a82cb…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 08:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 281708a0e125c8e542b319c7d3623c56 SHA-1: a7b23c4b9766dcc3e7a3c92b7d1bba7b79a54901 SHA-256: bb889d0cf37a82cbbca8eec3c97b41f3a262aa8b5c5f18afd15d8b1713d1afad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and numerous external URIs, suggesting an attempt to redirect users to malicious content or download further payloads. The document body is heavily obfuscated, but the heuristics indicate a likely phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 68 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 https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/nijamifokovuwowiru.pdf In PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/61669613202.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/48360922886.pdfIn PDF document text
    • https://triosms.com/userfiles/file/41344814082.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/69791760410.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/kasekujigawoj.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/80800794077.pdfIn PDF document text
    • http://93564497.com/userfiles/10906475820.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/21577477736.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/kuwudomikupenodutis.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/40916567967.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/ribagerujazuwefiwelisurab.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/dasegokotane.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/mirigikemofe.pdfIn PDF document text
    • https://securitydm.net/slicice/file/nexusexomelosuvisinipa.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/65067599352.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24296695593.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/28870930146.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109011727351346.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/83801438971.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/42937614565.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc6380067---37677789999.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/ratirobusutavizizunatemar.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/34433776970.pdfIn PDF document text
    • https://revive.fashion/upload/files/66117532958.pdfIn PDF document text
    • http://baove247.org/upload/files/26540583240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+wifi+settingPDF 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_off0000b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 13704 bytes
SHA-256: af454e483ac4a16f136fea1e5f4a00782f86461775935c9b9102c3ac89bd591c
font_01_sfnt_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10388 bytes
SHA-256: 4758447c22d57a0ba1ad81a112e13323f9d6422db00443bc378ac7dbcf1e84dc