Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7eaef52dfc2511…

MALICIOUS

PDF

78.5 KB Created: 2021-04-19 06:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ceac90618433e6ca2ac825cc7d555ee0 SHA-1: 2352ea52663604dc5f6e81a412c126071c0ae975 SHA-256: 9c7eaef52dfc251124a4c2c7098a29233529de7462bad78b3e6e24d531558c86
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'hillsborough county schools closed for hurricane' lure in the document body and URL parameters indicates a phishing attempt. ClamAV detection and ML classification confirm the malicious nature, likely involving a phishing or trojan payload delivered via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/strik?utm_term=hillsborough+county+schools+closed+for+hurricane PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495402/normal_605922a709132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_605854229113f.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/6896f.pdfIn PDF document text
    • http://bupro.asia/92290005169c3mam.pdfIn PDF document text
    • https://tigobatimomovo.weebly.com/uploads/1/3/2/7/132740361/wonumigek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421983/normal_605be329779ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_604e4075b06ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5fe21ddfede29.pdfIn PDF document text
    • https://subomegufixaj.weebly.com/uploads/1/3/6/0/136055214/19e7a08b0cce.pdfIn PDF document text
    • https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/fumukovigawag.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/pegimoxagiruveratosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_600817fc51bda.pdfIn PDF document text
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/mibutelabikikenureg.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/1724068.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/telecharger_attestation_d_hbergement__titre_gratuit.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/78095748558.pdfIn PDF document text
    • http://thrivewebs.com/hyderabad_weather_report_telanganawx8j0.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/9846199.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/733e7fd9d82933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/72595346870.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_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 5484 bytes
SHA-256: 81ad933f8111a31526611fecbc8ebe666a063c903635a4219fe22f5ba96ae622
font_01_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 10508 bytes
SHA-256: d5e43330828045940e0ea42c9ccd5cb0f43114f862d9935ed7642406f0d92ccf