Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d00512681c16a00…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 17:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbea0ca444f518062a23679bbd8ef5ad SHA-1: 6572df0000470082fb47eaf0fe9c76371e5b9ef3 SHA-256: 8d00512681c16a00205c82489264a4a1353ac1d1394ac89c9465f472f79c6796
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are structured as link farms on disposable hosting, indicating a probable phishing or malware distribution attempt. The presence of these numerous external links suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=ertugrul+gazi+ottoman+empire+epic+kingdom+war+game PDF link annotation
    • http://s-privod.ru/userfiles/file/rinewomikini.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/vipupozukegiwijare.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109030334142048.pdfIn PDF document text
    • https://onecre.com/images/content/files/39810627359.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/duramedoveguw.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/11406087288.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210902202630.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/nolivemanuwenopujumebi.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/fetukoxakiborimel.pdfIn PDF document text
    • http://skupka23.ru/upload/m/64433411187.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/91753981345.pdfIn PDF document text
    • https://susta.vn/userfiles/file/6573125341.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/49367476543.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/babenogepadivu.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/3863815647.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/xilijibuliweje.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v3tg8l98oj83l0qfdmdamvcfai/vupikiwodizejog.pdfIn PDF document text
    • http://sushibelovo.ru/files/wogezopuxejexofabelokilo.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/mijomovimuriwegonarugeso.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/85183813128.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/vibupipuko.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/91784548082.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/97840437015.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/19596350646.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/gixeje.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/99324268710.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/39407994182.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_off0000bdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 20772 bytes
SHA-256: 13b49b326082dd5fb94388e296ac418d38556c73868492a95d82fb288e5ace11
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 11012 bytes
SHA-256: b14bcf16c92008d7cd963dabf3c048ca1c29187cd375af0db4816df0e783ab54