Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b39e98a36c3cf68…

MALICIOUS

PDF

126.4 KB Created: 2021-05-11 04:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0a41408d3b40bef7d46595c96c0d7a31 SHA-1: b25114e8bf1d6b7b581058578cef2344cba713c4 SHA-256: 8b39e98a36c3cf68e090be4a5fc7bfb692cbf3050cfaf9960c90b53b34b79116
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

Heuristics 5

  • 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 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/strik?utm_term=fiio+x1+2nd+gen+firmware+italiano PDF link annotation
    • http://xuduxuv.iblogger.org/veterinary_tech_courses_near_me.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/biology_text_book_download.pdfIn PDF document text
    • http://lepawumu.22web.org/19001120723.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/3558112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_6062083cbbb17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_6000ece2b1879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_5fe974d7e2e8c.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/fenewatoxem-wefukusopexa.pdfIn PDF document text
    • http://derewopenila.22web.org/customer_journey_online_template.pdfIn PDF document text
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/gafipojezajo-futowavimotin-bewiboragiwoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475999/normal_5fdc7328008fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_602d79a565b4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/calabar_cultural_songs.pdfIn PDF document text
    • http://lutepotazor.onlinewebshop.net/math_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/chronic_myeloid_leukemia_mechanisms_of_blastic_transformation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756bad04-7940-4c12-9b15-d05b4b9457c5/fubepolutoluvomodumiv.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/68037160376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c02989-d587-423f-88e7-e495a927ffd7/motorola_vervebuds_100_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/sword_of_summer_magnus_chase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5724b885-8b05-4390-88e5-8640dfed0ad9/does_vermont_castings_still_make_bbq_grills.pdfIn PDF document text
    • http://zowomasi.rf.gd/trane_cleaneffects_air_cleaner_parts.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/54042468734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f16ec3d-d2f2-496e-ae32-49e6ab403785/bogozu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 68308 bytes
SHA-256: ea242f3b781e0503a82ab87afb32a3a1849bde86f9ff65860fbb99efe0c2848a
font_01_sfnt_off00019f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F1D 5348 bytes
SHA-256: 01c943e5617081954a16ea586d55ab1396d4ffe9c53145748cd87e41ef3be137
font_02_sfnt_off0001b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B15A 9644 bytes
SHA-256: a5251139af85caacb3e00a38e0d7bc45e69db022691936ca1ab9ae5c00719bf3
font_03_sfnt_off0001d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D29E 16284 bytes
SHA-256: 52efaa2941c39052d315c6eb3df042de82306e78390dd4a6ba9f84cb865853e1