Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe82a8818bbd7a03…

MALICIOUS

PDF

77.5 KB Created: 2020-11-13 07:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8375ef0494e156ce0b415433e98465d9 SHA-1: de38c5d611e899923be5bc010c39b85d8e974199 SHA-256: fe82a8818bbd7a03fbfcee659098cde9580e6867393ff7b97c624cce146f3457
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/123?utm_term=st+clair+county+illinois+real+estate+tax+sale PDF link annotation
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/4608701.pdfIn PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/fumijosakafolotitan.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/mekezazuboboru_pasazaw_zigexa.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/vemubeli-zesoguseboxe-segusotupiw-turatoxadaniku.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8753f218930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f874f1ad8699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f8d24ece684a.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.pdfIn PDF document text
    • https://nekegofoka.weebly.com/uploads/1/3/4/3/134364724/9830877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5f96cca8a11a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_5fadac4079bc9.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/vemufe.pdfIn PDF document text
    • https://rigafefabapamum.weebly.com/uploads/1/3/4/4/134486683/dodesuzodig_bezexevifubeku.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/wekibik/nufuxaparatakuxivov.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/rumikodiguzulefoxi.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_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 5064 bytes
SHA-256: 976fd5304d6b66a5d6e1d1e8ddb07f07f5cbdc15fdd940285188d58f264648f7
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10760 bytes
SHA-256: 753a4c7946bf175223ae6b3eed3161ebb23ec898ffb4c1d637fcac556ba5a52a

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