Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6d556074e0f860…

MALICIOUS

PDF

62.2 KB Created: 2020-11-20 07:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5aa90eb574d80782e7e88c3ef90b9b87 SHA-1: d187399001e94f55bedc8bf721adaf5dea8ef215 SHA-256: 1f6d556074e0f860fdfd38a2c037806b213028b4c426b00e40fbdd3f39b88c45
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/strik?utm_term=xecl4+molecular+geometry PDF link annotation
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/migog_razuviziwej_lirujife_malum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5f9885ad5d5f0.pdfIn PDF document text
    • https://damoleruli.weebly.com/uploads/1/3/0/7/130776580/9526670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5f987b4ab9ba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5f9e8c002ffb0.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/migobolufek_tabomujezer_kabexetilujakeg_damet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f8a6f9670555.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/mawuno.pdfIn PDF document text
    • https://jenititufevi.weebly.com/uploads/1/3/4/5/134595561/4144a6a29.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/juxatop/forza_horizon_2_tuning_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/20403589127.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/avg_antivirus_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/nazizasugakapibivifi.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/fesazifuj.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_off0000b6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C3 5108 bytes
SHA-256: fa1bdf87c548be3d0bdcea5f4e18154b3f86daf507d7e0eddba742f6e914ff61
font_01_sfnt_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 10676 bytes
SHA-256: f05ebc844bc227e96c0a1d046486daab81e1052d04864aafe80ddf91759b4244

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