Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d1620f1b3b8b89…

MALICIOUS

PDF

75.3 KB Created: 2021-02-12 02:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 59d7979382d738b29aaa3d41e503b016 SHA-1: 236a859bb2ed9b2f88594be2b625a716b9b8bb60 SHA-256: 83d1620f1b3b8b89faab6be73226b1834347f5c19ef07eaefe39d20d807a9150
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The presence of an embedded URL and the ClamAV detection as 'Pdf.Phishing.Trojan' further support a phishing or malware distribution attack pattern. No scripts were extracted from this sample, but the extensive link farm points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=pokemon+bronze+surf PDF link annotation
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/nidupuv.pdfIn PDF document text
    • https://tawuvumiru.weebly.com/uploads/1/3/5/3/135326103/vuralisekejarikide.pdfIn PDF document text
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/e48dd3b3.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/5131894.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/9743c8f90783dc.pdfIn PDF document text
    • https://nogulakotu.weebly.com/uploads/1/3/0/9/130969216/koxife-molasojif.pdfIn PDF document text
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/nuwikorunukivuk.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/17589b990.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/bunuxiniwip.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/9995464.pdfIn PDF document text
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/veneku.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/6a5f10e.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/jonora/mogwai_auto_rock_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/dusivekakibutunuj.pdfIn PDF document text
    • http://sosukaf.epizy.com/pidolumiguvazegaxan.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/94447625110.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/forklift_training_theory_test_questions_and_answers.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/using_alarmmanager_and_broadcastreceiver_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/ccna_security_2018.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 4924 bytes
SHA-256: 33e69af4b9d036a74b7c74eeaacf14a7962d57eff243c95a268a19feaff5c81e
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 11676 bytes
SHA-256: 1b9bc3101071d537aa530c939042afe5ce7bbe00a957617991cea18c9bd5656c

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