Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3524e4899787968…

MALICIOUS

PDF

77.5 KB Created: 2021-05-13 20:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6cc7411a4a914811cd6f6195b0ff49e2 SHA-1: 3f009c1bed8a20fb324aae12f7c720db71a88b38 SHA-256: f3524e4899787968bd0e7ecf334378ebdabf5115cb49e2768673b8e062d644e0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the structure of the PDF point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=porter+cable+fn250+rebuild+kit PDF link annotation
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/wujubumupi.pdfIn PDF document text
    • https://cdn.sqhk.co/dojoxuwote/vjjibhg/80930948450.pdfIn PDF document text
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/7cf2460f9e6d.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/ggjjOih/81728901831.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/hfieYWu/98212437424.pdfIn PDF document text
    • https://nomukemometikuf.weebly.com/uploads/1/3/1/4/131483138/refitij_sesebe_gudixajasufu.pdfIn PDF document text
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/ed7b8feaf8aed.pdfIn PDF document text
    • http://microdigitalmeter.xyz/jupavetukanivusuwetkyg9.pdfIn PDF document text
    • http://meetchat.space/can_cricut_make_vinyl_stickersdtmz4.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/bd4d980ebc47.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/lafep.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/4399160.pdfIn PDF document text
    • https://pezebojikunebal.weebly.com/uploads/1/3/4/3/134362674/kunopukuvoliro.pdfIn PDF document text
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/lupaxunikowu-vibanikajeruja-xepoxekarefuw-sepudu.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/9211c2995c.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/fjiLjcq/tarudaburokesa.pdfIn PDF document text
    • https://widedopeb.weebly.com/uploads/1/3/5/9/135970132/975cfcb9aaf9.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/54780e1f-7ef9-4df8-8845-5a020bbc6ea4/fopoxafekuzagiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ec6983-e880-49a3-8d4e-2839d8f78a33/logitech_k800_keyboard_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946d4c49-82fc-4b2f-9be4-4d91014a1a13/philips_everflo_oxygen_concentrator_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651eddc6-aa62-445d-b1c6-79a23277103b/best_home_printers_2020_cnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00f5f63-7750-4e59-9d7b-9b3841f071f4/judinaneke.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5440 bytes
SHA-256: 15d1fd2e5cb5e5ffb88248508e201b325e34a637b0250d12073f3faf1aebc617
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 11476 bytes
SHA-256: 767fd0e714aacf84deb5243b463ae78bdde43101e7fb54a6c2ef66aa3894ac4c