Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16ba11726fdff34…

MALICIOUS

PDF

81.1 KB Created: 2021-05-02 19:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7d50dd5c129913907ffad8df3d409e07 SHA-1: 2bc615311df9db8dca95ff2a34c22078dc99e56d SHA-256: a16ba11726fdff3491f9368def7bfefb3de070760896b7adc73107565714cf27
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, suggesting it is part of a link farm designed to drive traffic to various websites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users. While no scripts were directly extracted, the structure and URL patterns are consistent with SEO manipulation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://ponafet.ru/strik?utm_term=how+do+you+crochet+a+simple+granny+square PDF link annotation
    • https://lujalidulosegex.weebly.com/uploads/1/3/4/3/134369289/vitadubenamofusu.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/dutazozukapodonotalep.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/dGgg9if/luladavuguvidu.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/6jdhhTR/the_hangover_4_tamil_dubbed.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/aihb5if/49267683730.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/Xtjicie/ludo_king_app_download_jio_phone.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/basokepireriku.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/jMgihbW/strategy_and_tactics_ww2_sandbox_mod.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/mulenipez.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/central_asia_travel_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/dPBiaZU/best_arcade_racer_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/24jhmib/screen_recorder_with_audio_free_download.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/jurnal_morfologi_cacing_tanah.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/iihg1JM/zombie_survival_3d_mod_game.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/iajglq6/minecraft_pocket_edition_mods_1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/hbhjgdQ/tron_legacy_light_bike_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_99f098c12b954684b938c3c4d97628b4.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_f1095e5026ec4142a09a4dfab140b4a8.pdf?index=trueIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_841f29d3518c466f9301a9be8670032b.pdf?index=trueIn PDF document text
    • http://lowuguja.myartsonline.com/zesigumuxawafujulezod.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_9d488f297bc543d189df01be505641d6.pdf?index=trueIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_8964fe4e30714209beba7527aa6a8cce.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 5768 bytes
SHA-256: 9d782e6e0aa074adc511fcc8a5107abe5d2f323250ad7e41b0367ebf61161e49
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 11208 bytes
SHA-256: c191797297e6e9c0e23d41c587ebaa585e3ff262a2e22156f934c2729fcaa33d