Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1ed9f556603501…

MALICIOUS

PDF

90.1 KB Created: 2021-03-08 17:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 768c8eee30613b9cdef8c4c9e4b2898f SHA-1: ee08625f9c8da60213d50d2ff7ae826561d4b2de SHA-256: ca1ed9f556603501583f6f358fd089ec9722f24cc6ea2114f4e549488da9797b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL pointing to a redirection service that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to job searching, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=merchant+navy+jobs+after+b.tech+mechanical PDF link annotation
    • http://duplicwcnj.space/who_is_the_strongest_japanese_godflakf.pdfIn PDF document text
    • http://igonlinesupport.com/arsenal_camera_assistant_manual522hd.pdfIn PDF document text
    • http://shopbest.online/what_is_plt.legenddtiyn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_60052fc0f2a7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fcd9c8076165.pdfIn PDF document text
    • http://lynciguest.com/30307574771v9re5.pdfIn PDF document text
    • http://beliyden.xyz/johanna_gomez_reporterernmt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5fddc6caf1398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_602bdd6431c95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454054/normal_5ffe7243075d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_603bad01c9fcd.pdfIn PDF document text
    • http://surisetufuna.iblogger.org/is_tableau_prep_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ninukak.epizy.com/xipumubolapivaxokusef.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_a5cda6d7013047baa3f2741d317ee1de.pdf?index=trueIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_38d79d9d4a0a49f5904ff77dd41c9bcc.pdf?index=trueIn PDF document text
    • http://bixerexexotepe.rf.gd/vsphere_web_client_for_mac.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_da2c1df43d734ca397500f2490c9dc39.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_869eacaeeb8041ecbc2689a7dfa94ac1.pdf?index=trueIn PDF document text
    • http://zuwemanikipe.rf.gd/print_october_2020_calendar.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_88940250dca947c8b0809f993587253c.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_146ef71173a04983b02b01548df36970.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_b642c3757941419c884122cb47e0da87.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 5536 bytes
SHA-256: 4f405f66a572ba799f8bc309968c4b56c75b50b9e8c31f9b81e4977b891a2898
font_01_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 11808 bytes
SHA-256: 7b1a33d42b8bb782344c59963e8c311b8c09fa1881702533327b983486f884ec

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