Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbff389104d039c…

MALICIOUS

PDF

63.0 KB Created: 2020-12-07 13:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2bb5c2647905d1d4659e3c222c73292c SHA-1: 346a061aa0676f4c811711e0f35381d5f2f41dbf SHA-256: edbff389104d039c37e9831f8715711446e0456d46f748b83ac3fef08ddf52fc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or phishing pages. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lead users away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=naming+covalent+bonds+worksheet+with+answers PDF link annotation
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/9505608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402244/normal_5f9f04fa81770.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/5424938.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/muzeto-nafulizixufimo-webof-maxiwip.pdfIn PDF document text
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/6777f5f57c.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/9146081.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/3966851.pdfIn PDF document text
    • https://tebumozokafu.weebly.com/uploads/1/3/4/4/134471783/webumaxiwu-jimowubobed-rijevewo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1c3fc3dfdd95b60db3ffd/t/5fc2fb33e18c5c478e5e1d5e/1606613812881/earth_on_turtles_back.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc016b9c30a162e0c4e17a3/t/5fcca8b2260a660a6bd707a3/1607248051946/39959331860.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/jesoxevaruzerobi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06ef3116eb00e3c49974f/t/5fc11124a97599144e1d2526/1606488357353/26185770772.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/veropobewovadirironusinex.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA0 5676 bytes
SHA-256: 32c675c5919276740a196c6d0187539c88e977ef71fd561c192af963d0235328
font_01_sfnt_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 9736 bytes
SHA-256: c9a8cdb3ff1ceb04050d7b6badf1d7a7d4f898c7a2242d2e125a8cb18754aac7

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