Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15a9cdc0e37a957…

MALICIOUS

PDF

72.9 KB Created: 2021-02-13 01:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7401c106df971221f70e7a1f45885b7 SHA-1: d33e4dfe7ce6e3ade6b0d3d2add3ffef593b0caa SHA-256: a15a9cdc0e37a957b6a941206c20a4ac9fb2fb738e2377a0805315a2ce80771f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms, indicating a probable phishing or SEO manipulation scheme. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous suspicious URLs suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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 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.
  • 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/wb?keyword=us%20chess%20rating%20lookup%20old%20format In PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/egjfgeu/noxunewipifelejixirobep.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/bPujjHo/namco_tv_games_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/jjtwB2b/sozarugibifajuvo.pdfIn PDF document text
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/3925537.pdfIn PDF document text
    • https://jawoxaze.weebly.com/uploads/1/3/0/9/130968973/lezabevuti_wenekel_zenakijijox_tazoju.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/cAKnUOt/maldark_conqueror_of_all_worlds_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/NOjdgiL/amazon_seller_feedback.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/mokufonudovena-guluxajuzeduv.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/Ighgijf/pulp_fiction_prank_caller_meme.pdfIn PDF document text
    • https://nitejaxerovon.weebly.com/uploads/1/3/1/3/131379530/xetarasezuwoze.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://s3.amazonaws.com/sizabo/bootstrap_responsive_portfolio_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/project_plan_timeline_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/bdl_full_form_in_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/cursive_calligraphy_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/suvegizagiva.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/yasin_surah.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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 5504 bytes
SHA-256: ee380464df785ea01622b5001b0f36b41b9c39a769e341af8c221e3e9ba9146f
font_01_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 11036 bytes
SHA-256: 3087ddb141af87d4e2431d649d643dc8d46461513eec5b74e20a0092194808cd
font_02_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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