Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dc966045fa0a17…

MALICIOUS

PDF

79.2 KB Created: 2021-03-01 00:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a7cb1b4e78a066cfbd0c48a9b9fb2730 SHA-1: f3448a318b0011312c69744ffdd556a66b0b8306 SHA-256: 18dc966045fa0a17a1bd7b8e07dce03060670e6378c441ebf41b708e0d9dbad7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the use of disposable hosting and UTM parameters, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=best+stephen+king+movies+and+tv+shows PDF link annotation
    • http://regsenatvumen.website/339473262930avix.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/8jagijb/pazotuferemozut.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/25422474039.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/pXemPgg/black_and_white_marble_nails_coffin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_602fae6db2e3e.pdfIn PDF document text
    • http://handler-autoscout24.com/nibogekulawizewadatina61r3o.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/hiia9wJ/shooting_targets_for_sale_south_africa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_6036f486d7488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_603c15cb8d273.pdfIn PDF document text
    • http://damvglaz2.xyz/fimugoruwogubosora0l8go.pdfIn PDF document text
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/1321238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fffb53042a96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/62824073333.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/gikawavukoxil.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/43990013526.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/sobejafuxawobaru.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_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 5512 bytes
SHA-256: a962e2ece6f08a0506b62fb2a3a47a482748026f0e90930150108216921747ed
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 10592 bytes
SHA-256: c322fc5f0c605e1be20523ebd5c0c3151445c13061202c9b995b25955bba2d10

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