Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee7cd5d6208b2f4…

MALICIOUS

PDF

74.5 KB Created: 2021-04-15 04:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f2bd47335ce1194e9d553dd03826ed0 SHA-1: 501bfd0a6eaab831f0655a6c78655bf8dfc808c3 SHA-256: aee7cd5d6208b2f447c2d164f037851d1961d0d5469bdce12a4d64e5feb079b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=kotor+manaan+quest
    • http://nawenewoliz.22web.org/anorexia_nervosa_scale.pdf
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5fc9e039bb4c8.pdf
    • https://cdn-cms.f-static.net/uploads/4381740/normal_600fdd9a353f5.pdf
    • https://cdn-cms.f-static.net/uploads/4452389/normal_5fd6409659d8a.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_606e230e6defa.pdf
    • https://vapovudinawixe.weebly.com/uploads/1/3/1/4/131437980/192151.pdf
    • https://cdn-cms.f-static.net/uploads/4422627/normal_6041100e68348.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/e861c351.pdf
    • http://jelaluk.22web.org/kinegubilosofupuxoduz.pdf
    • http://polibesafonujof.iblogger.org/article_review_example_apa.pdf
    • http://masuvanoleseg.iblogger.org/calisthenics_unity_program.pdf
    • http://rigovutamejebum.iblogger.org/yokochi_anatomy_atlas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_9a73062d7ed54252a6f1c4e360eef8ff.pdf?index=true
    • http://waxusumuguk.epizy.com/1997174021.pdf
    • http://nimunofat.epizy.com/jijulelikeruserawoji.pdf
    • http://xanatilaguweve.epizy.com/annullare_aggiornamento_automatico_app_android.pdf
    • http://gaturavokev.epizy.com/23755230977.pdf
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_1984356b72014b929280af2af9c4ba9e.pdf?index=true
    • http://bonufew.epizy.com/86216760539.pdf
    • http://dofanetanezuji.rf.gd/ridoga.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_373cc370ba474d199eae26e0494a8132.pdf?index=true
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_c6288da390f4466fa223120de2195c6d.pdf?index=true
    • http://puwadokemizogu.epizy.com/83625356429.pdf
    • http://risafusimuwo.rf.gd/astrology_learning_books_in_marathi.pdf
    • http://fesenobonirizu.epizy.com/area_of_a_circle_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a9.bin
1fa3e245f29492e79984abd97908b9c26cc34a0c70b89030c2d264d593e9035f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 4892 bytes
font_01_sfnt_off0000f93a.bin
00e83e9257d4a23d0e9e7c0132ffae15d6ce1f3063643eef330fc59158cd0e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10416 bytes

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