Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7340dbaae7a55…

MALICIOUS

PDF

94.2 KB Created: 2021-02-15 13:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a9e393ba99e8f8e142b98201423ec0a SHA-1: 275a808fe5ef84865286cabceeee9bd6f257669d SHA-256: c2b7340dbaae7a55016207456522539be0cf8eb694e186d32c2989784c520edf
184 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical alert for a malicious redirector link. The embedded URLs and the PDF structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://crophysi.ru/wb?keyword=yard%20machine%20snowblower%204.5%20hp%2021 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426942/normal_5fc571b6076bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601c02d5947d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_601f2a1586761.pdfIn PDF document text
    • http://mavedelusudefiv.22web.org/22417287792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_60257b4c295a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_600245c7e8fa5.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/winozefolanijerejuj.pdfIn PDF document text
    • http://vizit.store/how_to_get_to_mount_fuji_5th_stationjclqi.pdfIn PDF document text
    • http://visezuxopusifik.iblogger.org/apk_file_minimizer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_5fd8ec85e1cb9.pdfIn PDF document text
    • http://vittorguxx.site/fractions_in_simplest_form_worksheetckxhb.pdfIn PDF document text
    • http://fubesewokelo.22web.org/24862416672.pdfIn PDF document text
    • http://tuwujunosemep.iblogger.org/two_birds_images.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5feb0d1fdd066.pdfIn PDF document text
    • http:///\/www.bbb.org\/chicago\/business-reviews\/industrial-equipment-and-In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://varaxekewuveza.epizy.com/zafumuwudorawakoful.pdfIn PDF document text
    • http://fosekor.epizy.com/85585398860.pdfIn PDF document text
    • http://vezoxonu.epizy.com/lowrance_hds_carbon_12_template.pdfIn PDF document text
    • http://gizimup.epizy.com/fireworks_worksheets_ks1.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001447d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1447D 21400 bytes
SHA-256: 83dff2a282af8b695ce89880c880818d1d0cd805e860bfc323b9d57d4595944e
font_00_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 5936 bytes
SHA-256: 2505c85034fc3c75d3252ce60f14dd990280e517f3ece0ab01e45942e03747e0
font_01_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 11900 bytes
SHA-256: 19f2dd8f1156b3dd94e896fbd826e0cfe86ae6551ff5961d639934cd178167d2

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