Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eefc046f72a3101…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 04:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2f0a0e13549c89d66abcaead2a8aa199 SHA-1: 8d36302926ee6b92f5bc7d215239a7aad2e3ba9a SHA-256: 6eefc046f72a31016fad4fb3f97df7b47dfdb2cf4bed6153e90b34483a2fc059
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, many of which are configured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=emular+celular+android PDF link annotation
    • http://snft.ro/media/file/gupuxaj.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/duwarevumefemubulanagem.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/52346311041.pdfIn PDF document text
    • http://x-mobio.com/upload/files/32214515690.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/getopejukitaketozopok.pdfIn PDF document text
    • http://cloverdiamond.com/file/53488762975.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/voxap.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rajoxesumakibuvurepasikal.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/80199794079.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/77077345848.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/18249408315.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908154950196208.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/89450619797.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/nenalib.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/43389807079.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/69592517974.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/46945916727.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/mubipivefudatuxewolosox.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/45405048815.pdfIn PDF document text
    • http://peoplefoster.com/pliki/lukefawabora.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/bukidabolus.pdfIn PDF document text
    • https://norservis.info/files/files/lutivikonabonuzef.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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10348 bytes
SHA-256: 1554ed110886c5d87bb32094cbbc44b02475ae91a47d2e2de15589ec4a379022
font_02_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 18944 bytes
SHA-256: 9e6208f40205b93f6378d337f0edca7eb12ad52a3cdab9069cf8381d96df1db6

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