Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2d5ad0b1246a3b…

MALICIOUS

PDF

69.3 KB Created: 2020-12-23 06:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7389b458f95bd6cd3825c5e0c1bce2c6 SHA-1: 1adc41c67e823542f28c4bcccea26821bdc67dc3 SHA-256: 1f2d5ad0b1246a3b7cb7cc17c8a02602afc96dde5e696991ae5a301e5d0f01d4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the nature of the heuristics point towards a phishing or SEO manipulation attack, likely intended to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=hot+wheels+unlimited+app+release+date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fcc28c9f18f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_5fbec254e8c44.pdfIn PDF document text
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/dufovifazapowil-lesosagomo.pdfIn PDF document text
    • https://raxipufed.weebly.com/uploads/1/3/4/4/134474150/lemal.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/6016326.pdfIn PDF document text
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/niladezarumulogas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5f90e7298855c.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/a8758baf11f2660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_5fb97afda8033.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/89f10758-9a4f-44ea-8355-97fb029fd3be/vesenaxunuti.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/ausfllhilfe_fr_die_anlage_er_2017_photovoltaikanlage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ad215a-620d-4965-8532-1960944dd478/fiscal_policy_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf9647acac6192a8653c2/1606285669320/jackson_high_school_football_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/56351817873.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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 5252 bytes
SHA-256: 9786ec9f1ac0e5418cb4f11c150737ee9a44ce0eccfedb411f997a11cf9a655a
font_01_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 11044 bytes
SHA-256: fa47dec148f3ffe5f200075b14af31b97372b6a8e5769975240f12637348f35f

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