Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d152437ba49cdb…

MALICIOUS

PDF

107.4 KB Created: 2021-03-23 16:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c639db87c69ba56c2e789462b2c0f36f SHA-1: 59a2b3f6c0094fa2567dc24c10cec576a6de64dd SHA-256: a6d152437ba49cdbe49db2ff845ea4acb8490d7b2eb822660048db2662b21079
186 Risk Score

Malware Insights

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

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 0.9974

Heuristics 6

  • 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 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://pelibifir.ru/123?utm_term=daily+express+prize+crossword+answers PDF link annotation
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/4757774.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/famine_affluence_and_morality_sparknotes.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/modokuzenaluz.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/lagid-zineruj-jurusuve-gumoked.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/hcghKrK/bagidifeti.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/evpidiq/steam_link_raspberry_pi_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/xeuhjhg/70045303403.pdfIn PDF document text
    • https://fivalamividow.weebly.com/uploads/1/3/4/8/134857099/bulapopamem_biwaxulomo_takumejuxeke_risako.pdfIn PDF document text
    • http://ridaxaki.mywebcommunity.org/12099127812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478430/normal_5fdfa125c424f.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/jhhdagd/86851424351.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/zuxabotenoruraguzas.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/67782057392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_600fad12917c1.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/ijeTzzk/58107524282.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/morgan_anesthesia.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/homer_the_odyssey_robert_fagles_audiobook_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_6023b9aabfc0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_603f7b296a6b9.pdfIn PDF document text
    • https://cdn.sqhk.co/lojiwoxaz/eKjhofT/earthquake_definition_kid_friendly.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/4jf9uhh/hide_and_seek_biscuits_nutritional_information.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/heij5ib/taxolifalinerosivirozowo.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/yidCtgh/zero_vector_space_dimension.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenasejubibe.atwebpages.com/autoestima_tipos.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/casio_gzone_commando_4g_lte_c811_specs.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/present_perfect_just_already_yet_grammar.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/28093582265.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_off0001699b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699B 5376 bytes
SHA-256: d3cb028919428d991a444741f191d26a348a37be0673204a935b2966a20ef341
font_01_sfnt_off00017c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C20 10520 bytes
SHA-256: 86183f2e7de6589d9e50e3ac5e0fd9f17f5158163ecfb6faa9ed73e13ba0dfa4