Malicious PDF — malware analysis report

Static analysis result for SHA-256 498652e4be04518d…

MALICIOUS

PDF

66.1 KB Created: 2021-04-04 11:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 769f2b06e087c903472220b7cedad9b3 SHA-1: 832afb518bbf6f7ebba025d0ee0f9f6e1dcdac62 SHA-256: 498652e4be04518d854c8a682aa3cea233dc9d6e7dfd0aa226cb7141cbaa60ec
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9859

Heuristics 5

  • 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
  • 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://crophysi.ru/strik?utm_term=icd+10+codes+110.0 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500001/normal_600291d142c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_601c858b3e2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_603437668b695.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/kubinafuzaw_jomoxekasuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_605677d7585fc.pdfIn PDF document text
    • https://jivezevovofefav.weebly.com/uploads/1/3/4/8/134896957/8017461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458827/normal_5fdcf11d3209c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_605e158d9ad63.pdfIn PDF document text
    • https://faluwesidiji.weebly.com/uploads/1/3/0/7/130738597/suxugiludope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5fd2d721cbc51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_7676e5c332884d43b2e3d25c6565ffa3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/casio_tough_solar_illuminator_aq-s810w_manual.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_fd56341735da478a8aa782e657af911d.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_6e9c7fe7cc4e4d70956516b7474c12e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/call_me_by_your_name_free_stream_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/tibagaluna.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/gerund_esl_lesson_plan.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_a47b27eb8c294db6b6fc0dee388bb117.pdf?index=trueIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_f8812e4b573c4720baac49c1e860dd73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/94606901149.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_f2b40baaf0bf4113b247ce4280740d4f.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 4760 bytes
SHA-256: 685690004fc905540055a787e3522ac417b48ca52b6f946c5116106530fc817b

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