Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e39dc2cad99e29d…

MALICIOUS

PDF

104.7 KB Created: 2021-03-14 10:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 572004cb54d8508e18de65150d35b6df SHA-1: 0d06941172307b3a98b6353fa2e9a6d1643421dd SHA-256: 9e39dc2cad99e29df6c9530d78a562a42ebc442a09ea9c3a9bd54701109d8717
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary URL identified, https://jacksth.ru/strik?utm_term=harry+potter+castle+universal+studios+hollywood, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=harry+potter+castle+universal+studios+hollywood PDF link annotation
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/a9f8f9f25abce38.pdfIn PDF document text
    • http://euroshopme.site/1841753453srmk3.pdfIn PDF document text
    • http://insurancesouk.com/bibliography_entries_mla_formatn4uf7.pdfIn PDF document text
    • https://tiselewo.weebly.com/uploads/1/3/1/6/131606631/xunodime_viwujopadeze.pdfIn PDF document text
    • http://olipaka.xyz/gafepewivoleteguk1brgc.pdfIn PDF document text
    • https://gijegemolu.weebly.com/uploads/1/3/1/3/131380899/japutifaweremipisiza.pdfIn PDF document text
    • http://gogogoinst.xyz/into_the_woods_tana_french_plot_summarysuil1.pdfIn PDF document text
    • http://life-news.tech/21080183183xbkma.pdfIn PDF document text
    • http://winwites.space/pukagedevofoziyi7ua.pdfIn PDF document text
    • http://yildirimotobursa.com/605619777574ko1q.pdfIn PDF document text
    • https://kaketoxemi.weebly.com/uploads/1/3/5/9/135989659/6de4a7.pdfIn PDF document text
    • http://top-odejda.com/king_lear_full_movie_onlineo4jda.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/a42e897a-00e5-43a9-97f0-28371ce2f5d3/how_to_reset_lowrance_hds_12_gen_3.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_6a7947399b7643069218787e5f4f4489.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7841c4-b94c-4644-86e8-80023ec98991/13730641225.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_3a1df43d636a4c54918341d970464b47.pdf?index=trueIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_7ffe4e6c79494860b1989a97a2d7746c.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_d3ce6db68eaa4d33b09cc4feb54b0fd5.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_a8448e4b64774437a9bc206bbc2ea876.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_2e539e25295846eeb918ba8294f3e08f.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_cbff97acb4b7459c9aff1d6550f39bf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e529b28-cdc7-47b4-98de-5f3432419b7e/hp_laserjet_p2035_printer_drivers_for_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923cef88-c971-4180-8e5d-3379d2059ad1/bunokazusez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 5376 bytes
SHA-256: f0658fd54b54c5693c2f82d39eba926443a16291f793bd0b9f681e041c3f37a0
font_01_sfnt_off0001533b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533B 12880 bytes
SHA-256: f189bca2c78c2fda04ae438b3708a9c9d7772bd699972a35ae23930a4bfa81c2
font_02_sfnt_off00017ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EE5 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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