Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdef2c9226ea3461…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 14:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 43cfb68bd2c574fb96cf9c33e97ab783 SHA-1: 7484e5b758b9270a09e3fbc69545106894ca11ae SHA-256: bdef2c9226ea34615c67fe905050fc111a970e94d4bed36bcfa2853246506c67
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm used for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=baby+i%2527+m+amazed+piano+sheet+music PDF link annotation
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/gusixexixupux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_60074db037605.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/dnya_haritas_dilsiz.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/cfop_vs_beginners_method.pdfIn PDF document text
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/xivalutepomafanop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6063ba334d725.pdfIn PDF document text
    • http://finonit.mypressonline.com/66443751462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5ff42d5ed519c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/de202274-5c66-44f3-a8c2-8fcc0ef2926f/zuvebegedik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7184e0b-e0fd-47c8-8678-5d76982babc0/paxoronujefefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d04971-0f5e-4dfd-b9f5-065aa8b28e65/xojisogezelubojiwozokux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48821bce-ed57-4ecc-bb84-f9d65ee9636d/how_many_calories_in_a_taco_bell_cheddar_chalupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e3ac4a-f427-477b-a95b-0250218428b7/ashton_kutcher_and_mila_kunis_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c6be76-2af9-4873-8b6c-c5f506e2afae/vexogeraxosuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6491e303-2407-45b4-aae6-fd4adf40c207/how_to_learn_english_speaking_easily_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cceaf60-5277-4400-af5a-31f8303a8251/jlab_wireless_earbuds_volume_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c479d560-2068-474e-be8e-6b0a9f7aaaf3/finale_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f73c840-0971-4553-b783-e81b8db01075/liliwilujumidixusum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5444 bytes
SHA-256: f0c6954a2f00117bcacb01b681aa147aa1dbdb5080688feb360cd59b6c50b832
font_01_sfnt_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 11252 bytes
SHA-256: a6c623a0c1a4cad8e98102cee7157771018fdb68126de03c54e47185f8931416
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2