Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3a62003e161bc8…

MALICIOUS

PDF

53.7 KB Created: 2020-12-20 12:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d2a612dce043ae4bba686d55e257f4d SHA-1: fc06f362e86fafffd89051ce2bcbb2546175ef0d SHA-256: ec3a62003e161bc8e2ba549c917148ebdab8c28fa6e19c4b688dc89187e9295c
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9466

Heuristics 4

  • 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
  • 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://traffset.ru/123?utm_term=cell+cycle+concept+map+answers
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5fc977c1a4257.pdf
    • https://bugibupezo.weebly.com/uploads/1/3/4/7/134711935/6501069.pdf
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/2604839.pdf
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/8a6e8e5e8c.pdf
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f9767f577775.pdf
    • https://dafanifupo.weebly.com/uploads/1/3/4/6/134645493/4151edd534.pdf
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/wafaribikova-xubotikomabana-zitanaxedaga-wukagogajuv.pdf
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f980add77966.pdf
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/xexivojubovenofaxev.pdf
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5f97cbfd0179e.pdf
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f9518daad59d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc509f16b97992eb5765355/t/5fd6fc2cc4373837b920f674/1607924780555/gisavorol.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/cheerios_nutrition_information_per_100g.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b20b.bin
b734b0ef0007329fa7b1a9de4f72eeec1b19b20b0ed286b91e6a67e76225efdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 5180 bytes

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