Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90aa19a26ded171…

MALICIOUS

PDF

84.3 KB Created: 2021-04-03 13:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a91e11645a4c6382d1acd2cca21abcf5 SHA-1: c5931fb180e6d54a69e578e8b330a9101e9dea6c SHA-256: a90aa19a26ded1710725e2f41a1c8f550c0a90e3c5d648ceec6a9e039ab4ddae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to a domain associated with link farming and SEO manipulation. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to distribute malicious content or manipulate search engine results, aligning with phishing or spamming tactics. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=etica+y+valores+humanos+pdf
    • https://cdn.sqhk.co/wezufunin/Z6jejgm/63679815653.pdf
    • https://cdn.sqhk.co/navotezive/ijlheJI/shopdisney_promo_code_august_2020.pdf
    • http://dekiweragaf.mywebcommunity.org/dibujarte_book.pdf
    • https://cdn.sqhk.co/zezetemirag/DzYPiid/police_ringtones_free.pdf
    • https://sejerujezoxovod.weebly.com/uploads/1/3/1/3/131398555/9155923.pdf
    • https://cdn.sqhk.co/xezexasag/djaiajh/kenubaxosa.pdf
    • https://wivapitawipalex.weebly.com/uploads/1/3/2/6/132682528/dojowudonadi.pdf
    • http://bexixibeguben.sportsontheweb.net/american_breakfast_menu.pdf
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/tipubireruze-joruxonegufegi-jufuju-tekuzuda.pdf
    • http://sivelural.mygamesonline.org/casio_fx9750gii_manual_en_espaol.pdf
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/12b441802.pdf
    • http://xezixaz.getenjoyment.net/bamboo_house_design.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c331bbd7-581c-4fa4-8957-d96e1a76cf7f/as_bill_sees_it_fear.pdf
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_8e3f1bd46ae54cceb6accfc14f64f4bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/adc8de03-eed1-48ce-8da8-2e7227d54ed5/fesumapib.pdf
    • http://jalebuvubo.myartsonline.com/what_is_the_best_batman_comic_to_start_with.pdf
    • https://uploads.strikinglycdn.com/files/96e2ba0f-8ed3-42fd-9fd1-ea90f05f919d/gokefu.pdf
    • https://uploads.strikinglycdn.com/files/0af3658e-658a-4a3c-8553-d13002ecf529/how_to_build_a_simple_cheap_chicken_coop.pdf
    • https://uploads.strikinglycdn.com/files/41117b92-180e-4850-8491-358adf2afcd0/antique_saltwater_fishing_lures_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/6f30721c-a6e0-401a-a7b1-b85e94c6660a/15796550961.pdf
    • https://uploads.strikinglycdn.com/files/0f476a3d-b413-4e16-8ead-726efed5acde/vida_y_muerte_en_la_mara_salvatrucha_full.pdf
    • https://uploads.strikinglycdn.com/files/ca0109f6-2805-412d-a2e6-b22c0cade83b/differential_equations_with_boundary_value_problems_by_dennis_g_zill_8th_edition.pdf
    • https://uploads.strikinglycdn.com/files/7f5673e1-3eb4-41ec-91d3-e392c0029a64/85600837337.pdf
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_58fa93101d6c488d88ad17e47c4ecad7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010942.bin
7ae1d7d5de254508db0ccc5114316ae83af8de046f867b82865c1e5fa2fab78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 5516 bytes
font_01_sfnt_off00011bec.bin
e66cc4e003c02ec4b02aaa1ef295229c6b14f8a33314c990c908c01354563a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 11936 bytes

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