Malicious PDF — malware analysis report

Static analysis result for SHA-256 350d31520f93102a…

MALICIOUS

PDF

69.3 KB Created: 2021-03-24 15:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4bf10d1a2a141b9862508ecb3c66e468 SHA-1: 5b3394aecb691f075e29e0fe7d2e15e902c5d73e SHA-256: 350d31520f93102ae279f54af6d1effcd3024c5d3f7fdbd15a3aaf5e7b70a296
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 0.9996

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://midufefew.ru/award?keyword=tratado+de+direito+penal+cezar+bitencourt+pdf PDF link annotation
    • http://xepokex.iblogger.org/beat_the_market_maker_download.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/wimuga-luwetolalafofuw.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/75228307978.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/jgrfUhh/vububezekomejeladumisa.pdfIn PDF document text
    • http://sport-stavki.fun/31486017144fzqfw.pdfIn PDF document text
    • http://dostafood.xyz/tepusinivamefakikuxiganok8l7fs.pdfIn PDF document text
    • http://inertbhjbj.ru/sports_illustrated_swimsuit_model_images_2020b4fej.pdfIn PDF document text
    • http://copyright-help-center.com/6189882937opixm.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/tidlthe/35088666984.pdfIn PDF document text
    • http://bestplacefor.rest/spelling_bee_applicationeg4l8.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/840152.pdfIn PDF document text
    • http://zigejetulanoda.iblogger.org/ipod_nano_6th_generation_for_sale_philippines.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/derona_xezawak.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/3961767.pdfIn PDF document text
    • https://wokogosomexar.weebly.com/uploads/1/3/5/3/135322546/893be012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/lelebufefepukuredivepev.pdfIn PDF document text
    • http://zimeketoxera.epizy.com/faa_far_27.pdfIn PDF document text
    • http://botevurisupom.rf.gd/rifizukikunux.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/moen_single_handle_kitchen_faucet_parts_list.pdfIn PDF document text
    • http://xifogufog.epizy.com/80917113624.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/binding_site_optilite_manual.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_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 5108 bytes
SHA-256: 014d4b7c98297a6941b014ced5226586666aba57bc629aebbb0ce004ad4d687b
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 12860 bytes
SHA-256: 75323d30c4342acc2d79e04074b31a85f1fcb493be6cf8147eae1e516fc66082

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