Malicious PDF — malware analysis report

Static analysis result for SHA-256 8928cddcab4c75ef…

MALICIOUS

PDF

137.5 KB Created: 2021-05-17 19:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1c28e520461a4ca261c3bcc4bd78334c SHA-1: 2fd0f0f5ad2b52fc3602bcd701f7205de826b719 SHA-256: 8928cddcab4c75ef7cd01d44d17446461839e1d0adf3b122ec0df0f5dbcb92ea
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting services, and is identified as a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=alcatel+idol+3+4.7+specs PDF link annotation
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/takuzimojose-lasov-naduvu.pdfIn PDF document text
    • https://cdn.sqhk.co/tiluzegata/hanhjOo/begufiwewesuwosawenupebe.pdfIn PDF document text
    • http://timedezalug.iblogger.org/julijidukopixanuv.pdfIn PDF document text
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/9eb4f754956c.pdfIn PDF document text
    • https://rumodabumuxe.weebly.com/uploads/1/3/1/8/131857513/zujuxamaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hfhh5eV/97787310563.pdfIn PDF document text
    • https://sinixamaruxibul.weebly.com/uploads/1/3/4/6/134653816/62ea7dce8.pdfIn PDF document text
    • http://kowezuzapine.66ghz.com/34390780672.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/jjjVXBJ/online_bill_check.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/jhihb1j/victory_day_ww2_us.pdfIn PDF document text
    • http://dujinos.iblogger.org/depth_first_search_algorithm_in_artificial_intelligence.pdfIn PDF document text
    • http://kokijejon.22web.org/kindergarten_english_worksheets_nsw.pdfIn PDF document text
    • https://sagunuriwofe.weebly.com/uploads/1/3/4/6/134602517/jomefuw_vidutabi.pdfIn PDF document text
    • http://lofoluwa.iblogger.org/68747972047.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/haGpjfW/brawl_bomber.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sadusijof.rf.gd/inverse_perspective_transformation_opencv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7757dde1-ca3d-499a-9e4e-6cf5c34cd8fe/jojajo.pdfIn PDF document text
    • http://kadebenatoloxib.rf.gd/idol_champ_quiz_answers_february_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dc0d97-95b3-4d8f-9e9f-ca5310644816/how_to_get_my_epson_printer_to_print_without_color_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7382a13a-76bd-4285-b59f-7ac57cbc65b9/12_mini-protean_tgx_precast_gel.pdfIn PDF document text
    • http://kasanuvuwa.epizy.com/auguste_comte_sociology_theory.pdfIn PDF document text
    • http://menesakuwi.rf.gd/joxemezukab.pdfIn PDF document text
    • http://bojefej.epizy.com/when_to_change_plasma_cutter_consumables.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
stream_002_off0000fae4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAE4 70196 bytes
SHA-256: 1c56f74c4828d989200a4e5a62438943a2b6baea3125f4ce0f896564b3d31842
font_01_sfnt_off0001c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6E8 5324 bytes
SHA-256: aa9f0d1341d49a7a87eb41f1a1ea3bb9ba22421b11e0868c0e6ed0c9007246ac
font_02_sfnt_off0001d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D932 12384 bytes
SHA-256: 6a641a827f709ca62e800e5c1a720faaa28afe05d727ee8a867586ece39e1086
font_03_sfnt_off0002026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2026A 16240 bytes
SHA-256: 7c37b2c73771c39c16fff84a7567db515744b0b5a14385bd382d4e9bd3d294b9