Malicious PDF — malware analysis report

Static analysis result for SHA-256 74914aa7507d6259…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 00:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70aad6149d33c026ddb350cad15bef56 SHA-1: f7c39f03dd066d36b92faf9f7ec5c4b9a3ea847e SHA-256: 74914aa7507d6259167af3aa50a06f254dfd558324c0c8b1d2fa531f27a2c08e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are linked to disposable hosting. The presence of embedded JavaScript suggests potential for malicious actions beyond simple redirection, possibly to download further payloads or exploit vulnerabilities. The numerous URIs indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=free+vpn+mod PDF link annotation
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/28288554116.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/gagoxetog.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/nibad.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/rozofaxonigapuxe.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/17138325762.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/10940923372.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/56043051130.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345b0388be0---ketagegod.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/1750187492.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/semevagidifogewatele.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/28674689876.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/26890907935.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zuzukugewonidej.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/76208813794.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/3811965227.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/73271866442.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/gisoj.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/31870261095.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/mawixote.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zixutapilimeromesate.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210906_49F16A3F5D56E623.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/ribilolo.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/kejedetivagudiduvomij.pdfIn PDF document text
    • http://castel.lu/userfiles/files/54150316506.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/43138452727.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_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 10028 bytes
SHA-256: bf85f08462646034adb69c129d90f95db9afa69cd96f7a57bbe4570c2298398c
font_01_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 18672 bytes
SHA-256: 8d30169a1123c5131568045a913b9fb9c97db5237bd7ab64563baedbce79366a
font_02_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1