Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b52117944e70754…

MALICIOUS

PDF

74.5 KB Created: 2021-03-12 04:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bf7cd877ab589dbc794d9b73c49ffe97 SHA-1: baf755e59048b60dac73a09a2c9f1870bf4bd57f SHA-256: 7b52117944e707541ed033a6369697ca3f8ea9182aa516d8296bbeea3fbf6c40
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

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
  • 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.
  • 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://druttle.ru/wix?keyword=cat%2527s+cradle+pdf PDF link annotation
    • https://cdn.sqhk.co/pavupaken/idDgjii/feeling_alone_picture_quotes.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/6161706.pdfIn PDF document text
    • https://cdn.sqhk.co/jisanipu/QbfiaDr/free_music_download_software_for_pc.pdfIn PDF document text
    • https://tamunalu.weebly.com/uploads/1/3/3/9/133999965/kukunexi.pdfIn PDF document text
    • https://sewajevujunu.weebly.com/uploads/1/3/2/8/132814136/pufegus_sogulutuva.pdfIn PDF document text
    • https://nunokewapi.weebly.com/uploads/1/3/5/9/135961733/9492596.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/lelevapoludaxonavasu.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/fij4ORW/diluvakiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/aLZhak3/gixomojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_6001c46c91fdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ff67e8b8fb49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487423/normal_5fc94dabe5b29.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/ac341d87-028d-46fa-ac01-56f72da25b11/tojovugof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4f2832-6692-40ba-ac94-9574ffcfcf6d/diesel_generator_for_sale_second_hand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bbdace-ed06-4b5c-9c0a-51bf555ba2a0/29919825126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60321bd-a355-4bb7-8f06-6b7d6107b50a/how_to_start_a_socratic_dialogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b464e1af-632a-4e3e-889d-ceb8b8a7d13f/radio_thermostat_3m-50_wifi_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f757a2c1-7b1e-4a85-9586-7f09509c9e1d/wexezidugisatuvovagesulel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a97bfd-41b9-4397-8ed7-75f3e9f5ddd2/piruvapaxatupuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d9ac55-0c16-433d-8f44-00f041fbc14b/popaxegopopofadibeli.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_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 5088 bytes
SHA-256: 3862d4724e6e949d383c8166ffcd601402d4f6597290fbcf20c975dabb1fd473
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10152 bytes
SHA-256: 8856f02cc3d5dd80bbabc2da2333edd6fca1d7795ed0cfb2b828d96b3481371f