Malicious PDF — malware analysis report

Static analysis result for SHA-256 5811cc81eefd428b…

MALICIOUS

PDF

72.2 KB Created: 2020-11-27 03:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a6b058e94b7dcdf4712114c4c64cf780 SHA-1: 9d12ed286bf1c7a0cf08bcc86bdfd7a91ea40663 SHA-256: 5811cc81eefd428b71c7a1b13b050dd7344d5da4482ed7ae5c329cc55b1be564
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. This behavior is indicative of a link farm designed to distribute malware or lead users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=the+purloined+letter+summary+short In PDF document text
    • https://degitigurot.weebly.com/uploads/1/3/4/3/134337886/magizimatos-kajewatenij-fazivipug.pdfIn PDF document text
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/4bca8a8f8.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/momejoxezo_medadelovedipeg_latevija_jezunifemol.pdfIn PDF document text
    • https://fulitadu.weebly.com/uploads/1/3/4/8/134863398/vadupagowumolaz-rakazobakape.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/3373854.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vabevoxemupovivaje.pdfIn PDF document text
    • https://muruvusi.weebly.com/uploads/1/3/4/5/134598427/vosig.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/cd97f2f3-6766-442a-96bd-37eecdae7773/zopalefusodowituwebizefap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce293696-5957-41b7-a0d2-9f2da58680ed/percy_jackson_and_the_singer_of_apollo_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bdb20b-6d10-43be-b7ce-a31d0d02d093/words_beginning_with_pine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee615c8-c221-49d0-816e-c36aaf8d920f/where_can_i_buy_used_exercise_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/88614521168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08540248-60d7-4139-8a61-cdf3cca397db/2139353830.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/list_of_all_literary_devices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f390b6-1f8b-46aa-abd6-d64a7e0405d3/18041613952.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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5248 bytes
SHA-256: d3f3c9f0367a685bdfec19f339792297679d126f68e1b49cdd4fd1259dda53cf
font_01_sfnt_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10756 bytes
SHA-256: e5f1d9ca866688b9d5f1ca59aefad55fb1eb2f112b16a189e3983715890b3d15

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