Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5fb8c13ddf153f…

MALICIOUS

PDF

95.6 KB Created: 2021-03-22 08:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12c78cda3d1ec58510e8836d9823e7b4 SHA-1: 129036c5671f84c09111020712a1c9f15535cc5a SHA-256: 6b5fb8c13ddf153ffeab92134d8142f717d8dbf45d3a2e650b002c9027802b9b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://soxebez.ru/123?utm_term=yaesu+cat+software+free, is a primary indicator of potential malicious activity. No scripts were extracted from this sample, but the PDF structure and numerous external links point towards a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://soxebez.ru/123?utm_term=yaesu+cat+software+free
    • https://fotunerabo.weebly.com/uploads/1/3/4/0/134042859/420866.pdf
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/8339940.pdf
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/vesef-sikekopiletoz-xaxunukokopi.pdf
    • http://topukovatawosu.sportsontheweb.net/zokato.pdf
    • http://fusobilel.iblogger.org/jezawujupijejefomefur.pdf
    • https://cdn-cms.f-static.net/uploads/4408343/normal_6018c2f1cc6b9.pdf
    • https://cdn-cms.f-static.net/uploads/4381289/normal_6045892ad8b77.pdf
    • http://vudasuti.mygamesonline.org/degoxesudiranajunekilo.pdf
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/7706836.pdf
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/vukazorozurujipomupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vuxikujare.epizy.com/81269193948.pdf
    • http://xobeminal.atwebpages.com/2_dimensional_shapes.pdf
    • http://zonafikepejese.onlinewebshop.net/ikea_bed_frame_with_2_storage_boxes.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_78536e2fa1864c82b03886bc1378f7e5.pdf?index=true
    • http://fararisujis.myartsonline.com/angles_in_polygons_questions_and_answers_tes.pdf
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_219a34fcdb0b4a3f9b4fcacfb498ec9e.pdf?index=true
    • http://lagadasisipas.rf.gd/48333907620.pdf
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_4d700ca16e8648eba23617c22d488a37.pdf?index=true
    • http://joretewad.epizy.com/2008_f250_forscan_spreadsheet.pdf
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_90a1e3b6cea04b6fb9e87be5db933978.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c97.bin
4642890c7a2d7faa275d6241d4127ea9b9dd0bb4158c058c9ca01c674bd03e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 4624 bytes
font_01_sfnt_off00013c66.bin
b029e34b49058a11e08d4ffff076e92716f4941f1ae3aefe4d952659a8093c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C66 11388 bytes
font_02_sfnt_off00016337.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16337 4324 bytes

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