Malicious PDF — malware analysis report

Static analysis result for SHA-256 d509dc8ee99bc618…

MALICIOUS

PDF

82.1 KB Created: 2021-03-17 14:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 73891ab628f9034173c53e0ec1fa055d SHA-1: 82189cb7482ca16f03e4897c93195aa56b2cc81f SHA-256: d509dc8ee99bc618c254e16a6f97291ab8ade28e3a78a1a824235326b9957e6f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('druttle.ru') that is likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=free+online+church+newsletter+templates PDF link annotation
    • https://cdn.sqhk.co/fokaladanolo/ghidhiV/skyblock_minecraft_1._16_bedrock.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/hfgkhjj/junonowifod.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/34841674388.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/how_much_money_does_fernando_alonso_make.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/philippe_richard_pressure_cooker_manual.pdfIn PDF document text
    • http://desokore.medianewsonline.com/sketchbook_brushes_free_download.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/gram_panchayat_election_rules_maharashtra_in_marathi_2020.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/97546591423.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/what_colour_is_your_parachute_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/ziedOgN/late_90s_early_2000s_rock_hits_playlist.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/513c97ee-6b3d-424e-ae6f-fe5ee2abbe2a/besogawelisomanezene.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/gameshark_pixelmon_6._3._4.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/lift_guide_rail_bracket.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_d91f3bca53984ac8b3812d65bedec414.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d39d8b-5293-47c6-b14a-8d88409d57df/57081729790.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_65845730a31b456cbb86db6175798de7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dbc1ff-41c6-4e66-88d0-16c551be5112/how_to_thread_bobbin_brother_vx-1120.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_f166dc9abe0f4d59ae8542e02e01ee6d.pdf?index=trueIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_5a8a35417bc042ef8d8d73f05956d726.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_1f9c4e4d283540a99e2971cd1ef05354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46d6d2f-5395-4ad3-8d15-1384199bef7d/libros_digitales_de_harry_potter_gratis_en_ingls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd233958-a0fa-4e11-a224-d9322aaf8906/espn_30_for_30_dennis_rodman_full.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_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 5220 bytes
SHA-256: 61e4ff490a11ed59d1a58d13570d47c4a4343f88f471d0f85b1863ca5a9697b9
font_01_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 10968 bytes
SHA-256: 5a8fc93e30eccfbe0d9bf42ba85817c621b50cec27c981a0b468e721b7e34ea4