Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bc8b85338b3dd4…

MALICIOUS

PDF

131.4 KB Created: 2021-05-01 21:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68bc9f3595dbfb230f2e46eb61d6dd3b SHA-1: 746babe1395a9bceb74fe4d4e5a4f5fd1539074f SHA-256: e1bc8b85338b3dd43385dc6f901b9c2a51122470adc16df2f7cbfe4b037bc753
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=bass+tracker+boat+parts+catalog PDF link annotation
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/jurigakafizexin-gitosoranewaf.pdfIn PDF document text
    • https://cdn.sqhk.co/xukonobos/WgdI0Dc/ucla_academic_integrity_quiz_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5feb03a5a6415.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/hhjVOhj/celestial_meridian_simple_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413243/normal_6008e9f84e741.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/1f3112f10ef.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/bnih8W7/free_room_rental_agreement_template_word_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/ie9ghhn/nomidifiravulexemusizukog.pdfIn PDF document text
    • https://nanewibogexuro.weebly.com/uploads/1/3/1/3/131382113/6266293.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/054fc181-bb6e-4782-974f-59603646cb9e/which_is_the_best_shark_corded_vacuum_cleaner.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_789c9849f8c74f65afc4d8754d30287a.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_72c27ab087dc41f3b04102a32f2d1df8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b810f130-2f1b-4cda-8ae8-0284f9c24337/wd_my_cloud_mirror_loses_network_connection.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_aac5101a55214037b8f1f88b135583f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48484dda-423a-4a83-be47-0a5d408af379/3892671657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9288e80-580b-4551-8029-05ccc77203d2/tutenopizoromizava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b652dc83-8ea3-4b7a-b4fd-1b6f2e7c447f/canon_eos_rebel_xti_400d_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38329e8a-5bc4-48dd-8502-c24b7e9d6cfa/21747738623.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_38d4acb85e55496fa62a54aa6a2630ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6a61f9-fd15-46f1-8153-a341932d5533/tesakomirivivopuvaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff115ac-f6a0-43f9-9af5-ccf6910b6570/duxukoxomogoketoku.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_91274b0a687e4e8b87d300136bcc8be4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4300862f-1e84-4c57-a459-4b3d8838fcbb/lefuvorod.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1A 4988 bytes
SHA-256: 2d484be56070ba88223733dbbc72142633e1b64e8e4813ab36f7952fc5f61aa8
font_01_sfnt_off0001ac1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC1E 14072 bytes
SHA-256: fff56b93b3f35acb1880d5778f5cdef945b5c4ddd108a5fc8c9d57ced8cf03fa
font_02_sfnt_off0001d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9FA 16208 bytes
SHA-256: 11f7ebbc94c4e3684261441063e157c722d76dec4256f0c7552e0cf543593d0c
font_03_sfnt_off0001ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF25 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34