Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61d36d46d4bd4b1…

MALICIOUS

PDF

88.1 KB Created: 2021-03-05 11:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0a29039dd2ff3b79402341128926aa8 SHA-1: 5cea510d97067257342f774ab15ec69e3559ce75 SHA-256: f61d36d46d4bd4b1ff86e6d8ee402b6f3b0558e7fc343ffa64a5d577fdc1000b
186 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 0.9997

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://golowaki.ru/123?utm_term=insular+cases+significance+apush PDF link annotation
    • http://wonamesavap.iblogger.org/xufazavewusuku.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/xumogude.pdfIn PDF document text
    • https://getelomivono.weebly.com/uploads/1/3/0/7/130776590/2948611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ff4044b58aa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fdeac2189db3.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/4838530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_601411b9466f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fe076b99efbc.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwuzasemifo/gG0gjx9/wumugabofowodo.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/dalepe_jovopadire_jefegefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_5feb337d0a7db.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/vagimep.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/fmgijgy/mufunema.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/kezubedotomorujubo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_ac2ae6232fd74aea9d94e029803ed2a8.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_dba6192a6259498f84b8aa5faf64e539.pdf?index=trueIn PDF document text
    • http://xuxejoser.rf.gd/video_editing_free_app.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_a60cf9f7f5204b18924a857fa97af041.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_9e5bc7ea4b024e2aaef6dc6bab51dce0.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_56b30102877f4188932c7363c469a436.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_568ca8b776a04c8c80641d2f8fbdce9a.pdf?index=trueIn 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_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 5212 bytes
SHA-256: cefb7a0ddd0c48c2cb67b7f3122c6b1a0c96b4b31714d56e410b990c570ae1d0
font_01_sfnt_off00012e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 10948 bytes
SHA-256: c9afd95756ddd20f9e0af1bd9845720edfa90435856b52c071ddbd0fa72bb392

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