Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d6c2ad54269edd…

MALICIOUS

PDF

81.7 KB Created: 2021-03-23 04:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7a06c2fcd04cea74631d0b6a21cf174b SHA-1: 2c8074cec46d38d886c5bdf6439391e978480842 SHA-256: 55d6c2ad54269edd819e23c3ffbc4e89cb3d4f5070aedb2a568184b20291583f
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/123?utm_term=best+android+cracked+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402520/normal_6011002361833.pdfIn PDF document text
    • http://zizubur.22web.org/antivirus_android_gratis_senza_pubblicit.pdfIn PDF document text
    • http://vanlit.ru/samsung_refrigerator_rs265tdrs_manualz0mjn.pdfIn PDF document text
    • https://lavolobaned.weebly.com/uploads/1/3/0/7/130740571/romiwop.pdfIn PDF document text
    • http://guwumuwepoxujog.22web.org/alphabetical_order_worksheets_grade_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_6023cd2598dd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd17d64075a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_600e25452e8fc.pdfIn PDF document text
    • https://divulonuwuw.weebly.com/uploads/1/3/1/4/131482828/mazadik.pdfIn PDF document text
    • https://nawolokiwepona.weebly.com/uploads/1/3/2/8/132814855/5566580.pdfIn PDF document text
    • https://xovotirepotu.weebly.com/uploads/1/3/1/4/131412955/tipudokomadi_zirozowo.pdfIn PDF document text
    • http://wegijezunulej.22web.org/rounding_to_2_decimal_places_worksheet.pdfIn PDF document text
    • http://krokoboko6.xyz/remington_chain_saw_partsr8b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_5fd1c2d6bb1aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_6c9d1e7fff634feb8e0dc3381551f745.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_8ed2e987110b46b5a79ceabbf4d69de3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/280ffd97-8aff-4144-9385-f261065278f5/zobanideta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0b466f-e9b8-4783-b8f0-27459e2ddee8/where_does_the_red_wire_go_on_a_ceiling_fan_with_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbbff24-bf43-4a61-8d87-2abefc47392e/82055927979.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 5340 bytes
SHA-256: 749e7efcdaf78a4db551549ddd8a6f245540f411b1e32deccd60936d4a3fec54
font_02_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 2704 bytes
SHA-256: 228e6d688b77248f22d77ab6962acbf0cc4feb9fde4c50722e2822b0ec77bd78
font_03_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 11168 bytes
SHA-256: 95a103aeaa4a52b6df8e25f38f08249631645a495258d5095285b10b55a3bde5