Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9c3f4cd8103c65…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 05:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c645892f2e11ac7903afb02343c586a6 SHA-1: 0e0a0d5d4834c770796c9a648232d4b06b3554fc SHA-256: 3e9c3f4cd8103c65b605f5eaf9498bef0208965abe9d3f3c426d5ce6a8040fe9
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=easy+piano+songs+slow+one+hand PDF link annotation
    • https://guxilidokuwog.weebly.com/uploads/1/3/0/7/130738661/sesafegosen_nireve_wojerajam.pdfIn PDF document text
    • https://mugijimefulex.weebly.com/uploads/1/3/1/6/131606494/wamibu_nimukurepise.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/eMcigkl/capacitive_voltage_transformer_principle.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/ZZP4jgj/whispering_pines_resort_map.pdfIn PDF document text
    • https://cdn.sqhk.co/gulidepiz/gfwphhu/35874861251.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/dMBTNgd/kufoxur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_601b2cce9963d.pdfIn PDF document text
    • http://wutukuk.22web.org/64377219264.pdfIn PDF document text
    • https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/3693478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_6018be7a6bfe0.pdfIn PDF document text
    • https://tobadagagu.weebly.com/uploads/1/3/4/7/134750152/pokofolu-bapujibo-narebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_60502284e8f43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_f1a088b2cc494c928234df9d33fce18c.pdf?index=trueIn PDF document text
    • http://nakitelas.epizy.com/calendario_biodinamico_2020.pdfIn PDF document text
    • http://kunitugi.rf.gd/benizawuzamapilabesobag.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_4b1d8a087aa4484281be31db3b4a2f00.pdf?index=trueIn PDF document text
    • http://mibofive.epizy.com/96496994222.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_c05762eca92544f88d3c466951d46636.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_1288a113db9a4248b2255ff4a4092624.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_0d9cd210b904481ebb250e40d7bb0f82.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_d7129b14c2924b238a899f13c7ca9752.pdf?index=trueIn PDF document text
    • http://roxeruteruda.epizy.com/32170973551.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_a54efc16873e4585b21c1c830b5fed5a.pdf?index=trueIn 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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 5276 bytes
SHA-256: 7c3ae70acf69fa8116a2eb6ceb1bbd37ed5a89dc258ee6306d11f8d8eac1ad9c
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10908 bytes
SHA-256: b4d37099705cf5ddd6b7fb6fb049720c98672e266183044fc54cd78c489f4840