Malicious PDF — malware analysis report

Static analysis result for SHA-256 7587b868754dad79…

MALICIOUS

PDF

87.9 KB Created: 2021-04-08 07:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a049361863175451d0155a105ac245e3 SHA-1: d226ba3694c204b6ecf07b1d74a368e948f6923e SHA-256: 7587b868754dad798e88edd9ed3a28e31cd4a2e3e3f502f66cd18e4ed29a0519
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Dungeons and Dragons character sheet pdf 5e' to entice users to click on these malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=dungeons+and+dragons+character+sheet+pdf+5e In PDF document text
    • https://cdn.sqhk.co/ladesajisama/jicYQgh/wetesuzuv.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/SfFjiha/bupafurupugujote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_5fd62cc9a3c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_60589e49b450b.pdfIn PDF document text
    • http://mixed-rootwork.com/what_materials_did_they_use_to_build_the_great_wall_of_chinalp30m.pdfIn PDF document text
    • http://shopwithsale.website/73777384048ouz0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5fe214c1a52da.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/hbiaZ8H/85015697339.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/4XWbggE/secureye_biometric_attendance_machine_software.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_605de55a06912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6052422ddabc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_ab3240411d8541d0a46b0a8397013f82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a728d05e-4907-4944-aec8-c81217ac3951/the_rising_of_the_shield_hero_light_novel_volume_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e625b5-6d3d-47a0-99e6-a2cd55abccc1/duas_to_be_read_in_the_morning_and_evening.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_360302a4219a4c888f7d68f06c449870.pdf?index=trueIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_7b18ad0c67ff4233a7163abd4cee3d94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davubewu/neverwhere_neil_gaiman_synopsis.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_45be093ca1be423083b6d841bbf4a420.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/57182947621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcd230d-287f-4353-8e88-4fc06b532031/3212048794.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 5344 bytes
SHA-256: 5f59593d4e537cceee15ceea6f4b11ad6ee1b7965897e13341af77dfc6a49933
font_01_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 11648 bytes
SHA-256: 8fe65e4b11a93dd4fcb9e5db67f1f7f245000ab45f1ffad535e239ab3665f2a4
font_02_sfnt_off00014359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14359 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230