Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3925f2b4c55457…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 21:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 823d8be1224aa80f76d977b13c51e870 SHA-1: 4e13af282a24db45bcffddef58561acfbea8398d SHA-256: 9f3925f2b4c55457a0c8db1e47cd78fb8e7ab5626a70372fb2b1a39ebb1ac858
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=where+to+find+downloaded+files+on+android PDF link annotation
    • http://anais.terminarz.online/kosmetyczka/krakow/files/kofofilibogezodunesumur.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/50016061639.pdfIn PDF document text
    • http://villkasz.hu/editor_up/zoxobizaxezofarijejejeji.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/12922714093.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/nisawarawufivulogovifebu.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/89350517095.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/bexatu.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/77194237380.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/zutokaliji.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/kijamolazogu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/gijovagafenijogogekuziju.pdfIn PDF document text
    • http://theponghop.com/upload/files/mamesule.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/61233159170.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86b730a63---refexitabukozomariwafosur.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109070513294942.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/86555931096.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/gowusiwariw.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/vemujipolizu.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/lekofijujupevijukomomuwi.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///nagamaw.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/86620492746.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/jafezijabusobuzavepapaf.pdfIn PDF document text
    • https://orrizon.ru/images/file/41511897938.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/37528719375.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_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 10532 bytes
SHA-256: 128affa99055bac86093649ebd97468eb574dc1e87895babe2cb207141f8752b
font_02_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 14292 bytes
SHA-256: 4f4331123b8e755460fe7b4d51aba948eaeb1c8a53926d9df03cf9eb3c1b9154

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