Malicious PDF — malware analysis report

Static analysis result for SHA-256 990d16643837721a…

MALICIOUS

PDF

93.0 KB Created: 2021-03-25 08:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6b64beabe830a75cbe156c3b128ee1c4 SHA-1: b17050f1383f5d25b1256f56b4412a43c3885e0a SHA-256: 990d16643837721a79f1703beb6264daa4a19b41576fe42cfb24cc49ff6f641a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/award?keyword=azorin+libros+pdf PDF link annotation
    • https://rorumelet.weebly.com/uploads/1/3/5/9/135969221/pawinaj-mogonig-tepabugumipojar.pdfIn PDF document text
    • http://websporizlehd.com/annual_report_design_word_template5heeq.pdfIn PDF document text
    • http://dewapop.22web.org/desh_bhakti_images_hd.pdfIn PDF document text
    • https://werunumugupis.weebly.com/uploads/1/3/4/3/134399568/zexaxexawa_xavunojimin_lepowukiwolumez.pdfIn PDF document text
    • http://arevakar-travel.com/tokyo_ghoul_live_wallpaper_desktop6j6fh.pdfIn PDF document text
    • http://realwockyc.info/romeo_and_juliet_plot_summary_sparknotes7msxo.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/tototofa-fuxozo.pdfIn PDF document text
    • http://lodixol.22web.org/gossec_gavotte_violin_sheet_music.pdfIn PDF document text
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/guvipom_jisega.pdfIn PDF document text
    • http://lesimuzonu.iblogger.org/attack_on_titan_4k_wallpaper_android.pdfIn PDF document text
    • http://pokulumaj.iblogger.org/arithmetic_series_word_problems_with_solutions.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/sokofugiwivagoveni.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/32551370886.pdfIn PDF document text
    • http://fruitslope.online/fojubemuligiroxuf7q571.pdfIn PDF document text
    • http://babozim.22web.org/hmh_american_history_answers.pdfIn PDF document text
    • http://pokupka.space/singer_2662_how_to_thread0yeyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://podixevobelataw.rf.gd/zutuni.pdfIn PDF document text
    • http://foxivowopejo.rf.gd/sutenibelakolal.pdfIn PDF document text
    • http://bojonovesigeno.rf.gd/what_is_my_sexual_orientation_test_buzzfeed.pdfIn PDF document text
    • http://janabamimis.rf.gd/how_to_make_a_simple_homemade_chicken_coop.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/kabeluxatoni.pdfIn PDF document text
    • http://bejofidexi.epizy.com/faduti.pdfIn PDF document text
    • http://javewexo.epizy.com/ragijewaluzinagu.pdfIn PDF document text
    • http://nozefemalevarug.rf.gd/who_won_sexiest_man_alive_2017.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 5004 bytes
SHA-256: 8e56b187d2494b1731c6f87166df1badd3df016a41116eb5d941d448c7335f7d
font_01_sfnt_off00013d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 12244 bytes
SHA-256: 0c8ddd19596a44bcbb5e354b49a60b5669e28c2c2ae6bd9aaf305e3718a1c8b7

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