Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e6291b652bab31…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 08:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd1698571cbc7a4550bdcf3506b3328a SHA-1: 660e4821bb4dd0130d613101aa6dcabcc4360785 SHA-256: 99e6291b652bab31f4161089d9ecdb3df9945f0f7d6b46fe5e286a1bd8e3efc6
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://varadimasszazs.hu/uploads/files/towig.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/85808721540.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/74692571496.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133193f970---zozopibupovopurabot.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/nikelawepugunavosulameg.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///zosewasazopeloviduta.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/83252149650.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109161008315877.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/80766b978de3b8a4b0aa7fe372192f08.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210917000745.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/81272602165.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/novabidifejibotagiduno.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vigiduruta.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/gixex.pdfIn PDF document text
    • https://norservis.com/files/files/gofexosazifatunidib.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/13885748538.pdfIn PDF document text
    • https://felicityokolo.com/file/gonimotowa.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/15339257092.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/guxomiwi.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/vafabobubulaladedorawepur.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/gifabebakuworot.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091519012773499.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/49112597244.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/67893732624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+delete+files+from+recycle+bin+in+mobilePDF link annotation
    • 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_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 18132 bytes
SHA-256: ff19e50b462fcf32f4351af37c7644ba21a41e4e1dce719f2c17969553eb75e9
font_02_sfnt_off00012f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F09 10808 bytes
SHA-256: 38cd397f5b680b4e9052c7e8283f243e656e8888f78eb45ed34ca3562bef0864

Open this report in the interactive analyzer, or submit your own file for analysis.