Malicious PDF — malware analysis report

Static analysis result for SHA-256 23172afc6878afe5…

MALICIOUS

PDF

78.6 KB Created: 2021-06-12 09:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f8dc70367cffcde629eecec4360f1a26 SHA-1: c32386144cf77b3336720cedebe53e3851fb1c9d SHA-256: 23172afc6878afe5207d951dea67475eacc35a08317768c26613613ef43bb14b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, which is indicative of SEO manipulation or a distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm behavior points towards a phishing or content distribution attack pattern.

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://laborke.ru/pbw?utm_term=list+of+liabilities+in+accounting+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483586/normal_601b02b65c0d3.pdfIn PDF document text
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/b68b3d1.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/junol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd98a7850327.pdfIn PDF document text
    • https://xiwigelu.weebly.com/uploads/1/3/4/6/134644840/furogujolotiwom-xegepamuxenaw.pdfIn PDF document text
    • https://talaxekagaros.weebly.com/uploads/1/3/5/3/135347480/9276302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_601671106d49c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fec36ebc77f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fc7ada1cde00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josinibugaju.pbworks.com/f/mevososeval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eab4126-b518-4c28-8d3b-244aacbb8c58/john_deere_sabre_14.5_38_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5e6571-8384-4a39-9d5a-1210dc58826d/7696861106.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/44554409715.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144425718/how_to_clean_a_lavazza_modo_mio_coffee_machine.pdfIn PDF document text
    • http://mepetibewo.pbworks.com/w/file/fetch/145049106/tubemate_2_4_16.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/w/file/fetch/144614751/how_to_get_minecraft_java_edition_for_free_on_xbox_one.pdfIn PDF document text
    • http://xawaren.pbworks.com/f/95103255620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15dd3788-b062-4033-9e64-8611ea441f8c/harry_potter_sinhala_books_free_download.pdfIn PDF document text
    • http://woziralipu.pbworks.com/f/23732520840.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144726798/baby_birthday_songs_in_tamil_movies_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b6e9b6-56fc-4fd3-87de-90c610fc074d/nalijog.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_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 5308 bytes
SHA-256: ea9c39510e6352b28ce9d548ed588695d104e446d423187bcc1a2cf57f48dd89
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 11552 bytes
SHA-256: d83d4c8db16d6eb45dd1b101cfc4bea5fcc79ab3699a665345126e5e5db5933f

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