Malicious PDF — malware analysis report

Static analysis result for SHA-256 38762dd801178124…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 14:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 57822e2a0af5c97519bcd13dcd95f475 SHA-1: dc5ca6a663e82213d2faa522e29ba29f6dbabf45 SHA-256: 38762dd801178124cbad9d50acbf7f4c58bdbe782f633bdae32e65b0965de313
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The primary URL, 'https://midufefew.ru/award?keyword=great+are+you+lord+chords+pdf+key+of+a', is presented in a way that mimics search results, likely to deceive users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://midufefew.ru/award?keyword=great+are+you+lord+chords+pdf+key+of+a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5fe69fb55c1a2.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/glencoe_physical_science_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_604db23a536f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5ffda6bfa986e.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
    • http://fidalanono.myartsonline.com/pawibozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253faeb3-70ad-4082-93c5-af47f2dbf285/gurofidatobogovid.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_01a976289b6a49d4bd900b47af94cde6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a16069-801d-4a6c-b4c7-57b48e3dfd7d/gevenikapujuxebipar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84343458-d262-4ccb-91a5-443a4c806cf5/3061444586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2184944e-5d2a-4bb4-860d-8d1ad9ba8800/salems_lot_vampire_window.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_bd49d3bf96c446ce98c4e40ac861cf4c.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_bb4127feb74b44249f0cc9521a4b8bc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04be3b5-b2e3-4bda-b613-df360a6564ed/imax_b6ac_fake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e325d58-9020-4e88-b9d8-50e5ebcac4ef/rozasopole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71f9177-7838-4e90-8141-1d0c191cc38e/lilo_and_stitch_amigurumi_free_pattern.pdfIn PDF document text
    • http://tirigofov.atwebpages.com/11623767998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664be9a2-127d-4a84-aff0-80d2f4432e14/how_to_install_printer_without_cd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e9ea3d-a8bb-4fba-aa3c-e020c85d1b59/wepebelojat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154f73c9-3b8b-402b-8c76-9fefdf8ad285/vajode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c527e20b-cfca-4a77-bbae-ea5a9115d98b/42249773798.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_47300f4690a84dc18e60ce16f04ada2e.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 5168 bytes
SHA-256: f8bcb3a3c75d832bc43ad9118ea56d6a07144bf8cb136b1047e5c6bffc3eace8
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 11416 bytes
SHA-256: 48be2450879da8864f4eadf8dab8fe8c8d4ed08fe10fc7c34060fc6bc30a23ff
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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