Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa2e1641268b3f7…

MALICIOUS

PDF

84.7 KB Created: 2021-06-14 14:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 55e10102a1cbbf8755a085f876fb2fce SHA-1: b81856e3e6c17e5c29733244da285aff76d9364a SHA-256: 3aa2e1641268b3f71567a0ac462ca9a471aef5f0c339279d7924f726be95dbaf
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://soxebez.ru/123?utm_term=kuensel+calendar+2019+pdf PDF link annotation
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/8f719ddc39bc.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/ketegazokiru.pdfIn PDF document text
    • https://gakififevorejep.weebly.com/uploads/1/3/1/8/131872199/bofakajazen_perupogalisa_zokeposajaduta_bozimos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/145149504/zifefodofowojonajipu.pdfIn PDF document text
    • http://fowobok.pbworks.com/w/file/fetch/144785904/bawoguse.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144955542/niwufefobezat.pdfIn PDF document text
    • http://jadubunid.pbworks.com/w/file/fetch/144671319/batch_convert_xlsx_to_csv_windows.pdfIn PDF document text
    • http://zuvumuname.pbworks.com/f/13109797028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94824a83-a87f-4c8a-9a43-e165c39fc20b/51666918068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e563853-6c51-4e69-8f18-cbbdc0e5ff75/84740110422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb89101-163d-4f86-90e7-b017d2a47d1b/5226625678.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/madame_butterfly_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1664f2-65ce-49a4-8c82-9db483c07b5d/how_to_connect_bluetooth_headset_to_yamaha_receiver.pdfIn PDF document text
    • http://bexujag.pbworks.com/f/section_62_of_the_law_of_property_act_1925_explained.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144602958/45007321201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0f57fc-696b-478d-b534-b8a706798597/bluetooth_receiver_for_bose_sounddock_series_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b3a497-ce73-4d5c-b2fb-e3d97827720e/31948057760.pdfIn PDF document text
    • http://woxikez.pbworks.com/f/ms_subbulakshmi_venkateswara_suprabhatam_mp3_songs_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc514c1-da36-40dc-8d02-f6aaef693f9f/xitaro.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 5600 bytes
SHA-256: dc8e4ae5cc23b2c3b77a0fd7ed7f1efb44e1a0da462f12f0e21829f3ef2b7447
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 11116 bytes
SHA-256: 36904482e3597f0caf5926291b3ea144c22303f2ab4c37a8a1cd98b229118c3a
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 10684 bytes
SHA-256: e503a80e702fbbba3ac31e90e8a3a7022a9157800d542ee34bd35c2e20b46d68