Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce4f0456c631c2e…

MALICIOUS

PDF

78.7 KB Created: 2021-04-18 11:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3b2d4b88af84b0dd5c267faa92c375f5 SHA-1: 8b5674e25c7555d3a11dc48a1bc202bfd95ba3bc SHA-256: 7ce4f0456c631c2ee8475d895e952c337d1f5a7d6accb31b0a766913563aa6bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=the+secret+life+of+plants+stevie+wonder+album PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc5e9d179fc4.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/zevasevud-waras-govodozapazut-wutojovig.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/IgisjbN/gotoxokadutoridimarebo.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/bDDibij/pioneer_sph-_da120_troubleshooting.pdfIn PDF document text
    • http://gratoramaa.website/vmware_esxi_6._5_clientysi0h.pdfIn PDF document text
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/0fefaba7058b.pdfIn PDF document text
    • https://dademogu.weebly.com/uploads/1/3/4/5/134591834/be24b983fc199.pdfIn PDF document text
    • https://momugidofene.weebly.com/uploads/1/3/4/2/134235368/4650899.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/Ezjajic/november_3_2020_election_ballot_texas.pdfIn PDF document text
    • http://sosed.market/farm_simulator_2015_xbox_360_cheatsnb0bh.pdfIn PDF document text
    • https://cdn.sqhk.co/pikevasoze/YjiJibg/12233174996.pdfIn PDF document text
    • http://reduslim-siteofficial.site/app_service_ip_restriction_arm_templateazibw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_60651830e80d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_6030cdab0bbb7.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/CqZicZy/2020_ford_mustang_shelby_super_snake_price.pdfIn PDF document text
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/zasekomataza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_48a2689422ab430a8924acff4c31f7ee.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_713e6e75a52d446fac5821523fff0511.pdf?index=trueIn 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_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 5636 bytes
SHA-256: 2b58a30643510fbe454968e9197d09ce3ed86835b90560daaa00d5dc131c95d9
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11356 bytes
SHA-256: 7fc3e4376104c38a5a47f6b3752e661ebd2f455540919ed85588d93ab2c6739b

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