Malicious PDF — malware analysis report

Static analysis result for SHA-256 040e1b36ef501d93…

MALICIOUS

PDF

80.8 KB Created: 2021-03-22 18:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 00059043d690e938e7074e6f6b2e0d7a SHA-1: 21eb7841a4f233fab69b070dc99223bb7b47720d SHA-256: 040e1b36ef501d9310f583b407f6a5a67f4ba924007d94c522ffb9d77dd29cf0
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 0.9994

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://ponafet.ru/123?utm_term=calculations+using+significant+figures+answers PDF link annotation
    • http://kozugufasuroti.mygamesonline.org/9th_class_result_2020_karachi_board_science_group.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/forirojumavatezako.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/biochemistry_and_molecular_biology_textbook.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/xomakedawitevifotureto.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/1861a41ab.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/jerekunememojopodi.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/indian_veg_fast_food_menu_list.pdfIn PDF document text
    • http://berozabekep.sportsontheweb.net/islamic_calendar_2020_uae.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/80c642.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/f639eba2a419c.pdfIn PDF document text
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/tomowoge.pdfIn PDF document text
    • https://lalemudisezevo.weebly.com/uploads/1/3/4/3/134359520/4618465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdad394-8476-4bfc-b7e0-e2bf34aa6d65/43447398617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4055d0a4-0377-4cb8-a629-64f5445c06be/52580528989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b2d012-c8e2-448b-bcf3-c51d33ba4f95/echo_gt_225_gas_tank_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542fe0d6-b424-4ce4-9155-33c44c7cca12/john_maxwell_servant_leadership_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223aa082-b794-479c-9972-01ce05fcbb95/how_to_say_fairy_godmother_in_spanish.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_c22262004e1e469c93921d3af15b360b.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_38eb372868e8416a979fbbfce11a5cf2.pdf?index=trueIn PDF document text
    • http://woranuganavot.myartsonline.com/gobupowarugagividudu.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_18a27c523e1b4293b368a42dea18c983.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_68c961a0a42e4870af3494b5d3a7340e.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_bd1d1975f5cb4ebab17e1f4e72ada0cf.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 5044 bytes
SHA-256: 8adaec80ed2d1f4793496196ff2c3c8836800b5cf976d1343402e706dcea59b4
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 11444 bytes
SHA-256: 6e9ffd4a632c01e103c75c945c87687139397fb07a327874209a472dff3a10ff