Malicious PDF — malware analysis report

Static analysis result for SHA-256 6993f5d6bf38c4c4…

MALICIOUS

PDF

75.1 KB Created: 2021-02-18 09:14:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4e7e71f273f3696aac896fc719c13193 SHA-1: 1854e133052ed0c561b92e23f2947c3570532490 SHA-256: 6993f5d6bf38c4c415d7e1b4704f15dd7e0a6171cbb87f0758b919d4b7f808f1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary external links is to 'jacksth.ru', which is suspicious. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests a malicious document intended to redirect users.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=is+cyberpunk+fixed+on+ps4 PDF link annotation
    • https://cdn.sqhk.co/mudifuto/ibNgeSe/79393070264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe59a26a94c6.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/lowixazabuduju_bipokoxes_fovifigominogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5fca9569a629a.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/phezyAB/pobizorodowunuboxetonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_601de6ad53ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_6021175397a47.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/qKI8ge1/sakaneviwapuni.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/tuxutedi/11808587420.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/pediatric_atopic_dermatitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/d._el._ed_exam_date_sheet_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/consonant_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/cardinals_injury_report_nfl.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/73353213191.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/zonugawidotamef.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/sudozerewotologifalosepi.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/archery_big_match_hack_mod_apk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5304 bytes
SHA-256: 0e92bb752990ec5f281037685c7c801151d656dccc1f233f917a03406d771850
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 10548 bytes
SHA-256: 0c0920b0efe10d93320d68e71a2a65c2b092c995e68c2bebeab7add811fcb5e2

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