Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5aa123ba7da4164…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 12:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35846597bc044c2396ebe15baf0e1760 SHA-1: 6d008dab3b14aa3341b4950f7e1ddbf56eeef359 SHA-256: f5aa123ba7da41644fd8e7f40a8f73a699ab94a535e3e8810023b2f07d300c3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It functions as a link farm, containing numerous links to other PDF files hosted on various domains, many of which are unknown or suspicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for link aggregation. This suggests the file is part of a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed010014ed---magawojak.pdf In PDF document text
    • https://cargotavio.ru/files/file/nogovamijivibadofu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/zatujoxofololobesanu.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/zanotejeguwusakivumer.pdfIn PDF document text
    • http://myredm.ru/uploads/file/4939326551.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/52496776100.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/74052530214.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/89884343764.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zunekebavujijijali.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/34024489480.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/58757694646.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/61608201227.pdfIn PDF document text
    • https://nada70.org/userfiles/file/93897504210.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19326362883.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/67414676872.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/75742970700.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/jesuzorivagefapawuj.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/lokaborisemusilofu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/39013053924.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613113a4aca46---54122175163.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/24795693369.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/pininonizizosusu.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/tenogakadejidox.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090512260473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dawn+of+war+cheat+codesPDF 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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10520 bytes
SHA-256: 310cdf535e09f31ce6fb90ce578acd787b470f077b8b76b86a1e1f5837be523d
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 18776 bytes
SHA-256: b4252aaf6e5538c4679ecc8e0f3449720327078fb9c3df1a579539dff8fe95d7