Malicious PDF — malware analysis report

Static analysis result for SHA-256 75de7220cc223408…

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 19:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5731ce7d1627f7f3f40d757cf772a90d SHA-1: 605376c18f51858646637bf54e50c06e74a3c3b8 SHA-256: 75de7220cc22340897ed548f98d578ca7eae33aca3b4df2371afee88e0f963b2
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the document is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=chakras+meaning+pdf PDF link annotation
    • http://zojifuto.iblogger.org/55348942702.pdfIn PDF document text
    • http://tublitalia.space/677809227214fd1n.pdfIn PDF document text
    • http://study-english-05.site/shiitake_mushroom_nutritional_informationit54c.pdfIn PDF document text
    • http://wspring.space/what_are_the_4_test_for_cdlbdwse.pdfIn PDF document text
    • http://koolmaxt.online/the_road_warriors_hawk79bka.pdfIn PDF document text
    • http://damvglaz6.xyz/782696378716nj5p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5fc88abaceb7b.pdfIn PDF document text
    • http://itverys.space/how_does_critical_reading_improve_your_writingrci7v.pdfIn PDF document text
    • http://9gusevshop.space/xogaximepitugososikimoxuk5h33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_602dd4756e0d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb83138d-eacb-41fd-9d39-30fd89792991/wabofixapovikak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42be45d2-79f4-4e13-94be-89cbf5a9e406/23023786059.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/78741890191.pdfIn PDF document text
    • http://suboxasolu.rf.gd/58721356905.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/av_converter_apk_pro.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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 5392 bytes
SHA-256: a456fdb028bb6fe87fef7ad426ea49a7ac3bd9f9e124ac3c8a3fed1c4963386b
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 2784 bytes
SHA-256: 5a4a289404b22f636cc5ba953a2fc5d4274b720ff12c954600a00d1cafd7b6ca
font_02_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 10884 bytes
SHA-256: ccb4db3b8faa50c476b29225f4dba80c2324740742a7ab96782a75a564b14f8b

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