Malicious PDF — malware analysis report

Static analysis result for SHA-256 95acd83f6b177e60…

MALICIOUS

PDF

83.0 KB Created: 2021-03-21 00:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 55737eba05638a9ed2ab4e910716fa72 SHA-1: b0627a47f58d6d2c50a8df2811b05d2ae2e7dd4c SHA-256: 95acd83f6b177e60f8136dfce6abbf29e17e25afcca4b589dd2e292016ab63c0
186 Risk Score

Malware Insights

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

This PDF contains a large number of external links, many pointing to disposable domains and link farms, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the PDF structure itself is designed to facilitate link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=when+is+the+next+free+giveaway+weekend+in+winnipeg PDF link annotation
    • https://cdn.sqhk.co/zenetofuma/cujc3id/39196770441.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/LwjdFjf/65172753532.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/JjhfjiM/busted_brakes_hacked.pdfIn PDF document text
    • http://miniluk.22web.org/vimalitumem.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/iiaiheG/vikarutorepexorekosepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rerorisa.epizy.com/sword_art_online_manga_order.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_1d6d9cec5714474f9bdf13850223d67e.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_f9509e7ea50b43eaa80fe0252ce9bd6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/marketing_management_associates_degree_online.pdfIn PDF document text
    • http://badokelo.rf.gd/active_and_passive_voice_examples_present_perfect.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/breeze_nxt_user_manual.pdfIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_7c14a89c317a43b68c9917f2b5d1e9df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jagux/training_complex_cognitive_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/tamil_nadu_railway_station_codes.pdfIn PDF document text
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_13f7e3d5e1d54a7c84655f0034ec2858.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_dca14e425e134a1d9e081b6f7158236b.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_bced92e53162431e8e51249546df2e44.pdf?index=trueIn PDF document text
    • http://bikilut.epizy.com/videocon_d2h_remote.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_1b4ac529763a46f09270d296a8a0dc72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/lionhead_rabbit_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/langmans_medical_embryology_13th_edition.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_c75a1fbcb53d438592d874bab6baf57b.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_403992569a694bde92bc2ab8dd04fe21.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5668 bytes
SHA-256: 9a45dd009cb619651d059a19859a77f58f7ca776a6b8d2b915e17593af805efb
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 11652 bytes
SHA-256: 5e68aff72dc970aafc3f808ae983fe197cbc8643b54cdbcb3eb88a3721cec30d
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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