Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5d3b62a1f9ed43…

MALICIOUS

PDF

74.5 KB Created: 2021-03-14 11:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c74efe99d9bc0e1a2f82003a33266f55 SHA-1: 9b38701e5617b312e93a5a7fde37f528c05e8f4c SHA-256: 2d5d3b62a1f9ed43e5199c2b87a6c6dc56627f720dc1b7c17301b4c58ffab9c9
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 0.9988

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://lozipotod.ru/wix?keyword=directed+reading+a+answers PDF link annotation
    • http://9gusevshop.website/72476425153p9a98.pdfIn PDF document text
    • http://letxxnx.org/20047416151zga8h.pdfIn PDF document text
    • http://slamelina.website/lim_please_input_answerupcg9.pdfIn PDF document text
    • http://tegor.xyz/jepekutebonodoferukibogti.pdfIn PDF document text
    • http://ehaberdevlet.com/the_raven_movie_1963_cast7jq2p.pdfIn PDF document text
    • http://dle-tpl.site/dixujafulenimujhmm.pdfIn PDF document text
    • http://lnstagramcentre.net/how_to_type_alpha_on_keyboarda5p1p.pdfIn PDF document text
    • http://goodsfor.life/verizon_fios_nfl_sunday_ticket_2020vegoc.pdfIn PDF document text
    • http://all-system7.xyz/girezawonunufuwixuftka6b.pdfIn PDF document text
    • http://women-ita.space/290058727017kphy.pdfIn PDF document text
    • http://gayerkan.com/how_do_internal_combustion_engines_workkji64.pdfIn PDF document text
    • http://baltika-trans.com/download_murottal_abdurrahman_sudais_mp3_alquran_full_30_juz_rarlrxqp.pdfIn PDF document text
    • http://kefets.xyz/2927052028tyjyx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_dbaeff4424ff450e9c9c7f7e8d1bc02e.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_17cb74e31be24d4ca3f3e3431e9ad06b.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_43b58224d1ac489d9fee29e08422dc19.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_7460310b128e4cd198f42c19b12f49ba.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_219630b8731e4b8bbac37fce8b8503f7.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_3474c8de64dd4ee4858b23063f22d055.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_cbe0b4df2972400688e145a77bd4ee53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18168af6-fe8e-4905-815d-3a3caabd3a4d/24895228977.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_62f9e8d03b7844d7b45b1b745d55c745.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_c2ce775e9dcf4598a5b21b24ec47486e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/142fb1ff-1d65-49bd-b347-50395112f866/61223256726.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_f4d5e61049f842cca2951266c67bdcfb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 5164 bytes
SHA-256: 4242f47814595b0a2519e355634ac890151f0e61ca03cdf2203deaa050689805
font_02_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10300 bytes
SHA-256: b2747169e85f96efd6e5793e30630d57ada0068c66a4662252bd79aa65a9b82a