Malicious PDF — malware analysis report

Static analysis result for SHA-256 3095d1c36be5da93…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 02:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9975c205fa6d244a63cdcc6198c2fc93 SHA-1: 0570b654ad1318d7e3c450bc038102c26033e605 SHA-256: 3095d1c36be5da93266f33e3177abd32321fe1702682966eb062d260fbd6165b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links to distinct hosts, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and a link farm heuristic points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://deepakbatteries.com/uploads/file/31634304338.pdf In PDF document text
    • https://hygradeinsulators.com/images/uploads/file/2322405035.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/43020143414.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/40601462425.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/73746036069.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/13974502153.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/78528563041.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/20595764637.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mojomuse.pdfIn PDF document text
    • http://tzsunup.com/upload/poresigusalusezilufu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/5735007701.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/56848465885.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/fajewaranogixipefatavo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/sumebanuge.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/bimizopilibewitalago.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dec446819---92032605841.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/5605180923.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/batijumatobowijamaxotodep.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/kusawomavufisowovodejoge.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/jowugelerijoza.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/bafukagigepunomigegem.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vowinevagamikowozeniki.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jemozovurovadamizawowuju.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/50952296658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=douchebag+life+hack+apkPDF 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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 10624 bytes
SHA-256: b978d58109debdb524f20c51d7a993e27f4300182d85faf85e51216d60505cc1
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 18680 bytes
SHA-256: d65458411e07efbc3960ccfe88f2335085aeff0e06dbdc786121474cd4cfc995