Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1713eff64e1a39…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 07:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f20199aece0a16e252039f3ceafc8274 SHA-1: b316d7d6ecb67bd78f3a1dacf73c6c6bd34347f6 SHA-256: 2d1713eff64e1a3964b4d325719236cca230d46fe9527f239ec91f7f276c9c98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm used to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the use of link farms on disposable hosting, reinforcing the phishing or malware lure pattern.

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 http://kibbkw.com/uploads/file/javebidepeb.pdf In PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/36988341887.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/31391988913.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/poxumumivenaga.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/xaxisetopexodedu.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/20067738264.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/nemidibexumotijeka.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/ravarejina.pdfIn PDF document text
    • http://tzsunup.com/upload/wifesak.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/17196407416.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/88364989420.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acc96b03a---47807784900.pdfIn PDF document text
    • http://e-menu.hu/editor_up/pidipowediwovisisegadomax.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/gotexebumo.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/boserisuwewura.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xeginomovovupekupokifexid.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c8f2f90c---puranoritewibulusexuni.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/mabikuvixisaguf.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/topiponitokefa.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/27532404917.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/sazawajutemam.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/21319001344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nakrutka+free+followersPDF 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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 17496 bytes
SHA-256: 9fae5064cdc34fac5860f74abbc22804769badfa174e94816bedbf19a5a2e04e
font_01_sfnt_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 10268 bytes
SHA-256: a0958858e56fd9c4259ff5e8d8df2c5aacd0d8c8cb97b3941e6c6e28cb39fa0f
font_02_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1