Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee986d7c5b61230…

MALICIOUS

PDF

83.5 KB Created: 2021-06-08 09:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 46826aec180bed2d40443f866183e4b9 SHA-1: ef7a867546a0a9c071f3c546115fce410df30376 SHA-256: 7ee986d7c5b61230e337cb220bf93e9961433d0c49876e981687fa35e61a38db
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-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.
  • 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://queure.ru/pbw?utm_term=bbc+chemistry+a+volatile+history+episode+2+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408851/normal_6066d20733dee.pdfIn PDF document text
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/katerosaroj.pdfIn PDF document text
    • https://dasubafetimediz.weebly.com/uploads/1/3/4/6/134673415/butipafep-nokatifupufiri-buzixul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_6061a9f1acbba.pdfIn PDF document text
    • https://lepujipalojim.weebly.com/uploads/1/3/4/5/134599636/819263.pdfIn PDF document text
    • https://gufagopa.weebly.com/uploads/1/3/4/6/134660265/8568108.pdfIn PDF document text
    • https://gefimopawudomew.weebly.com/uploads/1/3/4/0/134017284/pojusipuxog-vofek-mebefilepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_60291acfe7efc.pdfIn PDF document text
    • https://nidapekosoko.weebly.com/uploads/1/3/2/7/132740606/1736108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_600bc6a6bf17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_6059ab19f1680.pdfIn PDF document text
    • https://fumuzajel.weebly.com/uploads/1/3/4/5/134588097/vabajisi-vasedineborado-pavexu.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/ravekaz_petoloniranimok_rugukuxoxe.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/fosoganoxig.pdfIn PDF document text
    • https://nokajaxupi.weebly.com/uploads/1/3/4/7/134715681/ronoxovigituduz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6011e893c2a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5fe9421a73bdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5ffb57df87949.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fcf49c901a36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixememot.pbworks.com/w/file/fetch/144792168/18761815252.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/f/8162412904.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144445473/winosofatuw.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_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 5952 bytes
SHA-256: 8eba0690cd033a0611e66cbef0d46e147a2a34305bf2dd21051f12f456c75797
font_01_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 11028 bytes
SHA-256: 65e9c62bd35109961a7b817a1dd95f59ea4e8d6a80eebb6fa6e5166314e6c042

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