Malicious PDF — malware analysis report

Static analysis result for SHA-256 5951368062cb39d8…

MALICIOUS

PDF

83.6 KB Created: 2021-03-20 12:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00d7626a7c48a4a0e070f2866b4d6fa2 SHA-1: 462e25aef55f92be0647ddb23faeb72adc02976a SHA-256: 5951368062cb39d8b993e75409af803cd7cdd3b9fc59b1746bc9f7123869b0ec
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'jottigo.ru', which is likely a phishing or malware distribution domain. The PDF structure and heuristics suggest it's designed to appear as a legitimate document to trick users into visiting the external URL. No scripts were extracted, but the presence of external links indicates a potential download or redirection attempt.

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://jottigo.ru/award?keyword=international+journal+of+waste+management+pdf PDF link annotation
    • http://good-production17.site/brother_toner_tn-630_tn-660xrrea.pdfIn PDF document text
    • http://buytoday.cc/alkaline_plant_based_diet2loo9.pdfIn PDF document text
    • http://xamakag.iblogger.org/english_literature_novels_free_download.pdfIn PDF document text
    • http://oneitshop.info/sig_sauer_p226_sao_rxpcdiev.pdfIn PDF document text
    • http://gabofovopajojo.iblogger.org/lexofasamem.pdfIn PDF document text
    • http://pixeburunov.iblogger.org/14416360293.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/7eaa8e2f-0978-4540-a4f6-b92563d4cc1f/zosujudodevibojidosoboxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92fc3bd-5da3-42a0-b8f5-66b7cc8c1e28/66803757420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31419f5-c2fd-4325-9d58-99068ac945db/82607480436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53925811-c3bd-42a0-bdd9-32cd6dd6bf6f/pewuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571708f5-d113-4a1a-9b20-56f248a62ddf/51346401173.pdfIn PDF document text
    • http://fopajika.epizy.com/nabuwezapupudunirot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5684d884-c9d8-45e3-a4e3-0b8afd39d4f6/lamejiduremufojuvux.pdfIn PDF document text
    • http://sovizaz.epizy.com/keropasinogimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0d0aa5-c058-4fbc-81fd-9d0a340624a0/amazon_fire_hd_10_user_manual.pdfIn PDF document text
    • http://wavusuwu.epizy.com/71366665331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae26c2f-b63c-4d93-b91d-87f2d7aba0e9/kufunobopogerodopanilotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d170243-e11e-4d56-b696-f8ce27edabb2/kadadozemalanewejimeto.pdfIn PDF document text
    • http://dudanijop.rf.gd/konica_206_brochure.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_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 5464 bytes
SHA-256: 275888a0c4a5db571418337398ab0ab717225f9f7e81732d3988ee0df4256830
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 11228 bytes
SHA-256: 918367e3bf81f8beaf7f7b826f69e7025e89783cd7cfcaec4ed979f79486d30d

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