Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3b22bb23c75dd6…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 18:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1651e52b8b575cf04d3ed28e584c617c SHA-1: 32fe3764e41daf71a4cbd0fbb46cd5535cba20b0 SHA-256: 5a3b22bb23c75dd611b655e0ec0b95f8a8999f08837753c662d1af6912ffe6ed
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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.
  • 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/strik?utm_term=what+makes+a+temperate+rainforest PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484093/normal_60281651ccdf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_604efa0eedc21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5feb1135ccdb4.pdfIn PDF document text
    • http://lisolu.org/52862740398qxt8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_5fd15ac3b9185.pdfIn PDF document text
    • http://erse.xyz/temozufodisobewanvmxoz.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/lepefi/lazy_song_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/brother_knitting_machine_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368e4acd-6a8a-4882-8a63-2e214c8ff6a3/ejemplos_de_guiones_de_teatro_cortos_para_jovenes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa59560-3cff-4f82-a6fb-0ab716d47d15/waferoguvuxavovojimugiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0803ee26-e3fd-4157-a380-2ea29a375069/how_to_turn_on_a_mobile_home_heater.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_79f41a92610447c4b922b8f301e9a638.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/activator_for_windows_7_32_bit.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_04ed927037234359be25ef2ad8b8436c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/76111946803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22934cee-a59d-43cb-8a49-bc6625b9e9f6/jewotusogasatiwala.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_715f8ec95041411d8ca4e734f64b0cd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befafuni/97052866149.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/90876590993.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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 5188 bytes
SHA-256: 7a0663f16156876f34c473ba006644be15459c48fc7cba6590ba8802aca11b10
font_01_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10084 bytes
SHA-256: bf8b05338fabcf86ae8c004a1516cfe01ebd21d2d4d159865a2e945c4004df41

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