Malicious PDF — malware analysis report

Static analysis result for SHA-256 878ae7cef3c695db…

MALICIOUS

PDF

77.3 KB Created: 2021-02-24 04:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fe970c6abbc83b3f04d02278be9fbe69 SHA-1: c145793db1c7e4ab3cf79222b0d399b2f6afb8d1 SHA-256: 878ae7cef3c695db50ef7f3c4ba525c46865f36189c069761d73c170450f366d
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 0.9998

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=the+leftovers+serie+netflix PDF link annotation
    • http://quickpapp.online/si_yo_soy_tu_amor_en_ingles42pjq.pdfIn PDF document text
    • http://natural-shop.info/final_collection_letter_before_legal_action_template7nw4z.pdfIn PDF document text
    • http://guvinesusavilo.iblogger.org/monili.pdfIn PDF document text
    • http://tesocoin.online/nikon_d5100_price_in_malaysia_second_handig4ob.pdfIn PDF document text
    • http://getchambre.xyz/derek_fisher_matt_barnes_bleacher_reportmnteu.pdfIn PDF document text
    • http://italysummer.space/kedufarejesediduneaif.pdfIn PDF document text
    • http://centerbluebadge.com/what_are_the_major_conflict_resolution_techniques_that_can_occur_on_a_projectpbd8f.pdfIn PDF document text
    • http://istlan.fun/android_symbol_phone_with_wifiwu2rl.pdfIn PDF document text
    • http://vuvuga.xyz/respironics_remstar_plus_m_series_partsit3z4.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
    • http://pimorem.epizy.com/jefetulirunig.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/protect_multiple_worksheets_in_excel_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/15897971613.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/68506620076.pdfIn PDF document text
    • http://buwozefavimim.epizy.com/61808638263.pdfIn PDF document text
    • http://sewugobavi.rf.gd/46941348883.pdfIn PDF document text
    • http://kebanibaru.epizy.com/scipad_level_2_chemistry_answers_internal.pdfIn PDF document text
    • http://xadeboni.epizy.com/free_miniature_dollhouse_furniture_plans.pdfIn PDF document text
    • http://monuwuwotivonil.epizy.com/dublin_city_council_commencement_notice_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/men_s_suit_style_guide_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 4508 bytes
SHA-256: 901cc20d07c40142f13a2ea27521b09273a6fcd123114c0f02c96e840c9922b3
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 11400 bytes
SHA-256: 2e37b0af6aef6225c26aa77daf0cb93d7b13e66215613700a0e232aa9f43f390
font_02_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230