Malicious PDF — malware analysis report

Static analysis result for SHA-256 1753a1e5aec61692…

MALICIOUS

PDF

81.2 KB Created: 2021-03-30 12:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5938c588b0e1a5bd5aa6a67041a88d07 SHA-1: 26ae3f3eb50d3f3df03e93882ad52eba7445e90a SHA-256: 1753a1e5aec616922dd4154830c3abea2e4430d81fbe9b5c78d35695b3e726c5
186 Risk Score

Malware Insights

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

This PDF file contains a lure related to cracking software, directing users to a suspicious URL. The PDF also functions as a link farm, hosting numerous external links to other PDF files, many of which are hosted on disposable domains. This behavior is indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://resalured.ru/strik?utm_term=cabinet+vision+full+download+crack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409000/normal_603380f28f7a3.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/be2b51a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5fe7b15770c90.pdfIn PDF document text
    • http://paksorond.xyz/35060131905uarrx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_603f3a4b49a89.pdfIn PDF document text
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/4074254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_600a4e5d7f57b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_6012fe193f56d.pdfIn PDF document text
    • http://fasad-dom.site/how_do_i_connect_my_epson_printer_to_my_wireless_network_mac96yio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinixebun.epizy.com/latijarepi.pdfIn PDF document text
    • http://kalilom.epizy.com/liturgical_calendar_2020_united_methodist.pdfIn PDF document text
    • http://regadozemi.epizy.com/21352346995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6832ddc-c38f-4a47-bffe-3495e68a3ab4/how_do_you_disassemble_a_graco_pack_n_play_with_changing_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4780487c-2433-41a5-ada7-6ce22cf98e09/58263654391.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://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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 5276 bytes
SHA-256: cbdbd2f2c0d877a60056088b7101c7dbe24c9b779eb638aaf8e81e0da2a9e556
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10912 bytes
SHA-256: bb927051bd9a89598ca04df0f860dfddd48507eebec66a4e96d80aea0bec5a8a
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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