Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e982c636ca0d84…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 03:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a31d4295b835d52297b3cd85f5657553 SHA-1: 93d43fb8eaad858a64b508327477b49a02558848 SHA-256: c2e982c636ca0d8447bd2aec183a3ea0e7389836506f5874666634b72e0434e1
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The embedded links, such as 'https://yafferge.ru/award?keyword=australian+open+2020+women+s+draw+pdf', are designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=australian+open+2020+women+s+draw+pdf In PDF document text
    • https://cdn.sqhk.co/zezinojox/jaMiACc/jegejadizarir.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/case_study_method_in_psychology.pdfIn PDF document text
    • http://helpcopyright-service.com/essential_cell_biology_3rd_edition_free_downloadp4z8b.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/ZCgc2fz/forward_assault_obb_download.pdfIn PDF document text
    • http://rafale.store/68722427765nrxk9.pdfIn PDF document text
    • http://momsmall.space/84802495064nkaw9.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/90366373003.pdfIn PDF document text
    • http://relax35.ru/pidole39iff.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/environmental_chemistry_class_11_ncert_notes_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/ghoy0ia/161855051.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/vamapevurelurofuxodaxomu.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/miahd6M/31295046289.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/9fa23718-9517-4cc9-bfd1-b10e56a9e7a4/plt_legend_pairing_mode.pdfIn PDF document text
    • http://levapoloj.onlinewebshop.net/chemistry_textbook_part_2_for_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/bazipolomakivanelonuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052e5064-1814-47bc-9882-54aa81e4ba02/velix.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_0db73187747348aa8341dbb014d6ca3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08bc743-44c1-456e-b621-5a57844bb218/dream_meaning_snake_biting_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c5c242-ef19-442c-b0a2-48b9534043e0/puxexixitusogivu.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/dodiroz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a45cd7-9773-4e6f-a572-2311cebbef99/68951972126.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_a8a8b947ef6b4021b0994bc4c021418e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 5540 bytes
SHA-256: 01c7d8e8b7d33a520510ffbb467840a6ec0341ae23d02af3e4e0b69a4efffa05
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 15124 bytes
SHA-256: 988487858f6b7b437ba599b8615b0209328a8593bb12f4cfb2f01196389f980d