Malicious PDF — malware analysis report

Static analysis result for SHA-256 113751b11f60fc1a…

MALICIOUS

PDF

86.4 KB Created: 2021-02-23 18:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5e9fc106271520521b034f3e1372c1e6 SHA-1: 36918668c787d65e9a1e93240e7eeb89ca6aa4c4 SHA-256: 113751b11f60fc1a449accf2b369fa71028a8a0da247aedc7b384c919b68efee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=psychic+predictions+for+2020+taurus PDF link annotation
    • http://prizinsta365.website/domestic_animals_worksheetsst07y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_60268bbf02cf9.pdfIn PDF document text
    • http://curvepreloved.com/macrumors_buying_guide_apple_watchcvtct.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gjheHH1/46963810060.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/e9iiidV/5_seconds_of_summer_2020_song.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/Wjihhji/duet_on_wilcox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_601bcb963c84c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_602e6ce3daa02.pdfIn PDF document text
    • http://jefaritixe.22web.org/99285830050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474170/normal_5fd9023e3a35d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewelopax.rf.gd/yekkada_yekkada_song_female_version.pdfIn PDF document text
    • http://denotepisijolib.rf.gd/risk_assessment_software_template.pdfIn PDF document text
    • http://buwebone.epizy.com/acid_chloride_to_ester_mechanism.pdfIn PDF document text
    • http://linopiziv.epizy.com/5th_grade_math_multiple_choice_questions.pdfIn PDF document text
    • http://xapimiwosusuv.epizy.com/46195716352.pdfIn PDF document text
    • http://soxuxemakim.rf.gd/year_calendar_2018_template.pdfIn PDF document text
    • http://sivutesafukim.rf.gd/what_are_the_3_types_of_plate_boundaries_and_how_do_they_move.pdfIn PDF document text
    • http://fametofet.rf.gd/jipifugajebavisofikuf.pdfIn PDF document text
    • http://tekoboworitutew.epizy.com/fupux.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_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 5588 bytes
SHA-256: 227faad2474aa892fa1c82bbc4e83a6873ece63afe2aa3040e0fc460fedbdf9f
font_01_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 10240 bytes
SHA-256: 544e07ef99a4eb539f6389845106ae969a4145328594a9782dd8d997f80a8163

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