Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f438cbe771ac8ef…

MALICIOUS

PDF

84.8 KB Created: 2021-10-06 17:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 014d539c897863c1654ad3e5e60aca1e SHA-1: 8fd24fb2494a335bc54df57ecf86be52749ac77e SHA-256: 3f438cbe771ac8efee25b0ea33eede09651644f1f213bb20be304ac9b872cd3c
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 or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or perform further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=true+repentance+meaning PDF link annotation
    • https://saleskerala.com/ckfinder/userfiles/files/87775853237.pdfIn PDF document text
    • https://partnermind.cz/images/files/26485419157.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/27671995378.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/47401818703.pdfIn PDF document text
    • http://masaze-bohunice.cz/images/texts/file/79367678636.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/39317330960.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/45980935230.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/vosovafujekapoke.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210908202335.pdfIn PDF document text
    • http://benetalent.com/upload/files/bowenunadekinosanedunoni.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/34473844461.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/bonojumegegero.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nababopanekepinasemizon.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/98436110533.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/29250259755.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/49065211982.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc865825a---1728162287.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/sifilofukoxama.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/62594592868.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/94172470721.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be0280cd81---4190974589.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/9750793907.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109031456236659.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/64239521699.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/26457694969.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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10448 bytes
SHA-256: 0665914059e047a3a8efe7312d8ae39c6513cd4db87be19513ce52c08a8da0df
font_02_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 18872 bytes
SHA-256: 9e4ecc646e0e1974d1cb178ab1602b7ad26f6de7e7119c1762411eb45cfccb45