Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c83166540e387…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 18:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 10d15ea79c601054c2ae9a0dcaca9063 SHA-1: 106ce174381eed4a4f38bffe3842a77d5e221e98 SHA-256: da2c83166540e387c6ef48174fb17bdc67dc4033f90a4e510a90c9f7b48174eb
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 0.9997

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://baarspo.ru/123?utm_term=spatial+transformer+networks+blog PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5feb19665dd77.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/arboles_frutales_de_clima_templado_en_mexico.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/princess_bride_movie_script.pdfIn PDF document text
    • http://giveaway2020.info/9107224922i7aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6023cfe5b0d8b.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/metaphor_worksheets_7th_grade.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://pokemonrivals.online/razejq5trh.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/r_statistical_software_books.pdfIn PDF document text
    • http://preplafond.xyz/20769336912es0g.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/11537368723.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/telugu_calendar_october_2020.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/gowowiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_6066871d20dfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d93768-5c2a-4da3-9eb9-f1743f105f3c/asmaul_husna_yang_artinya_maha_esa_adalah.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/frontline_magazine_september_2020.pdfIn PDF document text
    • http://bopubedoru.myartsonline.com/musegizomemamud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d7bb2d-b23f-4a01-8310-6545d3a9f441/tanip.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/77642409856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790b9eee-a172-4b74-98a5-f880cb75c262/86002405766.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/87628526190.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/37385070115.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_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 5620 bytes
SHA-256: 3dbdefcca02eb0c28f2c957263d08907419b6d2fbb49203ca46b3eb03b3b2117
font_01_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 10692 bytes
SHA-256: cff8b9b97220f2ec5c1a7ffca557718dc5a8bf43aa74cb6e0ff62d9074a6f032

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