Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3cd87432cda010…

MALICIOUS

PDF

82.1 KB Created: 2021-05-20 15:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cd34f44616d32525ee4ef1a60e9b36c4 SHA-1: 81bfd28cce77cf6b5f23c91bbd48db1006a40989 SHA-256: 9d3cd87432cda010fdfcc84695bca7abdae3f6f9386f7bce1da51302e7ce4c15
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URLs, such as 'https://resalured.ru/strik?utm_term=last+day+on+earth+survival+bunker+alfa', are likely used to redirect users to malicious sites.

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://resalured.ru/strik?utm_term=last+day+on+earth+survival+bunker+alfa PDF link annotation
    • https://kixajunurepe.weebly.com/uploads/1/3/1/4/131406563/larijosotivizakudin.pdfIn PDF document text
    • https://zevutegelaxi.weebly.com/uploads/1/3/4/6/134687356/9838847.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/68981e.pdfIn PDF document text
    • https://rugomekedakore.weebly.com/uploads/1/3/5/3/135302214/vebimosugoditigelota.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/luridodumivomiz.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/fenaba-munemelejojoku.pdfIn PDF document text
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/7826854.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/b46faa9c-f7e1-4441-b83c-f8f4486574b7/daxusimonerekiwep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefe531a-ca6a-4aae-ad6a-6b50a8eea965/33512561688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c362cf-2d1b-4373-ae1b-c596bf9ff3c0/rukesuvuxojinekaxaluje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f803346-aba5-4b98-b910-eb0e66c45e72/hoover_windtunnel_max_uh70600_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7133d3-4f10-4c4a-bbbc-49f9c3f091b4/does_kindle_have_a_reset_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4696d5-d0d2-4b6d-b0b8-494ea2ec72bb/how_to_know_polarity_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda7ae79-2ddf-4793-925a-28ccee6d188e/kigem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975e3a9d-5d28-40c4-817f-48f2596dcd59/lizixenekej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7bb714-5063-4d7c-939d-f4f622574fda/zikilofapofoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3602bdf-c8dd-4f0d-adac-a6a212549852/96712752864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c265797-17a4-48de-adbc-00f8b267ec8f/the_pit_and_the_pendulum_figurative_language_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22302406-8ae6-472d-83c9-30fabda8143e/xosetipiwoxidew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f898a2-03c2-4f49-b777-00b3a6e97b2c/best_mp3_to_midi_converter_free_download.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_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 5300 bytes
SHA-256: 3cf81f8328a2d25b5585ebb51d4fafd222880d45b3c2796b06fd63b722e54aa5
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 12492 bytes
SHA-256: 845755f1d3933b0df4aafee7816ed20add0aa91f092f3834be36c95c1d6dab7d