Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b87073fe56df9b…

MALICIOUS

PDF

82.0 KB Created: 2021-05-29 22:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0d04fd67803890c558f514fd3be3db70 SHA-1: bb8503c49099cb8eccb3f9eacbcf9da291a73c37 SHA-256: 56b87073fe56df9b018b6192bf0e00a9c8f88731790e93bc6b7991d08e7332bc
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to promote a free download. The embedded URL, 'https://druttle.ru/strik?utm_term=geometry+dash+meltdown+hack+apk+mediaf%25C4%25B1re', is the primary indicator of this malicious intent. Although no scripts were extracted, the PDF structure and the nature of the URL strongly suggest a phishing attack aimed at delivering a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=geometry+dash+meltdown+hack+apk+mediaf%25C4%25B1re PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fd08e5dbb397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_606ae01c73c36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5feb5ccd089c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_60146eb242043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_601a12ef91fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_6057a9c9e4c07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5fcdde560aa47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_606e892dd1b1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5ffa345ca6aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_603cb6ac31ef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fdeaffd5ca8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_60252b49cb89c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/16efce78-5c2e-4b6b-996c-dbd22c2aa187/99578321266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2712914-05dd-46e1-bdc6-b4e6f85f5432/collector_cars_for_sale_by_owner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c549828-958c-475f-92c9-e225a66b6ad0/30990814316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceedfc83-1494-4261-8c60-fa022b53ad96/murachs_oracle_sql_and_pl_sql_for_developers_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b2671b-d8e2-44b4-9721-c8df45bdb5b5/how_much_does_exhaust_pipe_replacement_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c20817-ab4d-4730-9905-beb49a4a11a1/a_wrinkle_in_time_graphic_novel_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9fff4a-3f08-4d6d-a1ae-c3ca76763567/ejercicios_de_enlaces_covalentes_e_ionicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d979f2a-983e-409d-8798-023d2a3e8e49/70578710061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8296d9-cf09-4cc4-9145-c50bfce2853e/add_email_account_outlook_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2c29f1-b1fb-4796-85d4-194509cc2857/vizio_sb3820-c6_38-inch_sound_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44693afa-4b43-4698-a482-15643bf28a0c/kujelusiruxafogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9a6ad6-00ad-4858-a17f-fb4f3091c975/how_to_get_adopt_me_pet_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8f5cb9-a99d-4dc9-9122-04ef7e04e62d/38765207795.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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 5504 bytes
SHA-256: 4e46b226718c73e5dd06ee1c3c7c87a77b520b471ed70e506367db5713052086
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 11652 bytes
SHA-256: de7c041ef5d17573fc34fa4ead816bd65fa374c3555cfe67815cbc53d59d1352
font_02_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230