Malicious PDF — malware analysis report

Static analysis result for SHA-256 717a28839c7d2a7e…

MALICIOUS

PDF

73.0 KB Created: 2021-05-12 18:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c716eb0b3bd8067b1247c37e7978f36 SHA-1: 27884a2bc308dc508a38176f60035bf434a4a623 SHA-256: 717a28839c7d2a7e4e98718c01a557fd8fc8380b1a6f27c5cbdc9d9cab84f76e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain ('midufefew.ru') that is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=walmart+pharmacy+plainview+tx+hours PDF link annotation
    • https://cdn.sqhk.co/fedovipawe/CYjjg5w/expanse_series_book_6.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/jogokegewuveberetosonipo.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/dhdhaie/67013811196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_604a4e1d81a4b.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/aHxhdFW/29708937564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_606629fdf391a.pdfIn PDF document text
    • http://fageweduso.iblogger.org/chain_rule_worksheet_with_solutions.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/b3339c11-b2eb-4b49-a213-9cf380f2564e/how_to_fix_sharp_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb52e50-8dcf-4752-a4d7-ef6c659fe186/pozesebet.pdfIn PDF document text
    • http://zuputes.atwebpages.com/supafefifalifesawugotur.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/9997942731.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/rajasthan_10th_board_form_last_date_2019.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/epidemiologia_veterinaria_carlos_julio_jaramillo_arango.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/biwokusakerijav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b147a8-9e2a-4414-9685-8f4c4b1e10a7/bissell_spotclean_proheat_portable_spot__stain_carpet_cleaner_-_blue_2694.pdfIn PDF document text
    • http://tarojiwisow.rf.gd/fiction_reading_comprehension_worksheets_4th_grade.pdfIn PDF document text
    • http://rijejonusax.rf.gd/13720412286.pdfIn PDF document text
    • http://nepikonetoterit.epizy.com/acca_f9_text_book.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_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 5388 bytes
SHA-256: 3b1c7605a12b4d94b8ac478fc204e2caeca069b70321af4ecbf5a7ab18acc17d
font_01_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 10820 bytes
SHA-256: b56a4b8dbaa6b8df679e89587811eb5498d263fc1d368518f2e5568e962487f3
font_02_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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