Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba3f550f940975c…

MALICIOUS

PDF

69.7 KB Created: 2020-11-17 14:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cdfc385bc7d00e6f68ffade0f1e3ff3d SHA-1: d73d8d874d93441f5b554b807040c51fac199c4d SHA-256: 5ba3f550f940975cb0685a0ee31e140de0d1e13c24d449d43d7774fc97b13582
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 0.9998

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://trafffe.ru/aws?utm_term=subtraction+using+expanded+column+method+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418171/normal_5fa53ee653351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_5faded0c102e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8fa1ace0ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f92dd898ee54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5f9a7c313df87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_5fac2af612056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5faa160b335c6.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/0312ad.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/kufazete/fuwix.pdfIn PDF document text
    • https://s3.amazonaws.com/tifemuma/37896650551.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/2323106885.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bleach_vasto_lorde_ichigo.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/appareil_gnital_masculin_anatomie.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/lenox_wine_glasses_clear.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/41795660876.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FA 5956 bytes
SHA-256: d273add0536194f0b7e119378cd637e05eddf2474191fba7ad29142edf20e264
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 10688 bytes
SHA-256: bb50830f4da9837d432ffeb734e1b04617a8825160d35cf2a071a9074a554ea5
font_02_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 16088 bytes
SHA-256: 9b6ad5722d12b30ebaf898f562fd4d85af749794f3aca0f1f676e444c262175b

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