Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d112944d2a4088a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 10:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 01dad6e3b0d27e86609e56a6ee34e7c9 SHA-1: b9d17179e33a057e748c6e1c0b422a599271c108 SHA-256: 8d112944d2a4088a760c4d856d689b3f67ab04d597cb2224e00c04f87c0ec2d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'nomylo.ru' which is associated with a link farm designed to redirect users. The PDF's structure and the presence of many distinct hosts suggest it's part of a larger campaign to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=show+me+my+wifi+password+android PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vlpd1d9fgf9m4mpar94qs1g0tp/34328433691.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lelifipu.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/wetaxotisadajixipek.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/xikimunomoko.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/wunoj.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/vadavudur.pdfIn PDF document text
    • http://apismorava.eu/docs/72706319628.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/97153173461.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/setemulisasiku.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/99358059074.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/xixuzijupuxopaxefa.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/1886642227.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/xudazu.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/zulufobibopamikegelaju.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/xejixakatarixuf.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/zelegepuwulewowej.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210917105836.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/laleso.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/wuremek.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/64442751097.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/xalijamojil.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/povufimiwijobanatapiri.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/41244015384.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/77088537331.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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 17408 bytes
SHA-256: 714d6d5eddaa3ccc1abf5204e007350f922a8e27d7edf46ce5fc25c3c95c6876
font_01_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 10892 bytes
SHA-256: 45fe99bcdf3cc2039379b67951249c47a10dcc57b99a6684b1b270aefe040bb5

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