Malicious PDF — malware analysis report

Static analysis result for SHA-256 35927b3bb32cc76a…

MALICIOUS

PDF

86.3 KB Created: 2021-03-20 11:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a64fac77b499082b55ad68eef05ab93e SHA-1: f4f9a37ff3f72dadc6d3ab4c9b2039a9475c7191 SHA-256: 35927b3bb32cc76ac986b97aed0daeb490d1cb432726640d768f9a43c38e7107
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9958

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://xajibur.ru/wix?keyword=evolution+and+selection+worksheet PDF link annotation
    • http://sugewute.22web.org/84293255968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481539/normal_5ffef63ea1851.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/butterworth_high_pass_filter.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/GjhjcHX/27477596358.pdfIn PDF document text
    • http://manovina.mypressonline.com/5376961221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_602a8b7d6d016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fdbe1b912ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_60286db0aaeae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_602ed099de743.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/RSgj5sz/24510988669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_6041c2da6d126.pdfIn PDF document text
    • http://noxitafevinuv.22web.org/ge_spacemaker_microwave_manual_jvm1650.pdfIn PDF document text
    • http://timinome.getenjoyment.net/why_use_seasonal_produce.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ggkSZKV/folding_bushcraft_knife_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5fcc463f6c245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450502/normal_60064ed57de2d.pdfIn PDF document text
    • https://cdn.sqhk.co/rewagujil/e3CjbPk/87387254650.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/96654584484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5ff393fb5365a.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/durivelufowojimar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_602ef19b9fc8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofufinaniba.rf.gd/learn_french_with_vincent.pdfIn PDF document text
    • http://rirafibokiraj.rf.gd/genetalijivudejuwodugi.pdfIn PDF document text
    • http://wekumut.epizy.com/zozadisadegakedodilo.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/national_library_of_medicine_reference_format.pdfIn PDF document text
    • http://nelojodopon.epizy.com/53739910720.pdfIn PDF document text
    • http://wijexir.epizy.com/swann_dvr_4575_installation_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_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 5200 bytes
SHA-256: 49539a57e0f0c6b45e2715d83599b3888a926dfc68ce0129e4d6a13fc6ab6321
font_01_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 10736 bytes
SHA-256: d7af6b00ed8573f160be942ea8bada34e3c18d47ec81b90e0af66162c3e8993b

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