Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ff9e75a8edf25d…

MALICIOUS

PDF

99.2 KB Created: 2021-03-24 15:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 20687124c12c37e59ac96dcf4c2954ca SHA-1: 5d763ee7dab7f200de74b21bc7fe9ce8646e7000 SHA-256: 53ff9e75a8edf25db10f70cd83ad5c55a50a55b4ad9f2ebd60836eb7d3ac8d98
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. One of the primary external URIs identified is https://nipisod.ru/strik?utm_term=black+and+decker+compound+miter+saw+parts, which is likely the malicious payload delivery point. No scripts were extracted, but the PDF structure and link farm behavior strongly suggest a phishing or malware distribution attempt.

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://nipisod.ru/strik?utm_term=black+and+decker+compound+miter+saw+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fe7af342afa3.pdfIn PDF document text
    • https://libexezelidod.weebly.com/uploads/1/3/1/4/131454359/kituvaga.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/libros_de_administracion_de_empresas_2020.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/b3f7eab2ba60.pdfIn PDF document text
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/pazomiwipewexu.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/what_happens_when_you_exercise_30_minutes_a_day.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6019d5dfbcede.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/8986201.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/tizavigarevogin.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/ba672d23-ffc7-400e-a4fa-d1d30b910794/is_6_figures_a_lot.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/33333268165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f6bc82-9e6a-468e-a677-f9c880ff45f6/2018_forester_2.5i_limited_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/hp_p3015_tray_2_pickup_roller_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4f477f-5861-40b4-aaf1-344bce80d54c/how_to_cite_articles_easily.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b66c7ed3-0860-457d-b596-ba0fc88e1c9a/76682626855.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_off0001463c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 5424 bytes
SHA-256: 42f740fee816c719e08f182555657b490d443a522a41fe844a7756104d51a654
font_01_sfnt_off000158a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A7 10960 bytes
SHA-256: dee01623d2ba31748cd9360f8bf53f7c15d51015461bde764ceb515e10cb4591

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