Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6d2aa66d849181…

MALICIOUS

PDF

78.4 KB Created: 2021-05-09 10:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e10593c4f908508377ef7def6fba2c5c SHA-1: b21942c6ae3cfd41f4334cdc37c1ac04b8907b26 SHA-256: 3e6d2aa66d84918167e0d7a63d2829cd61271262f65f0171a125df41ee214d61
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

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://vilenefex.ru/strik?utm_term=plaque+of+ergastines+context PDF link annotation
    • https://tolakuvekefub.weebly.com/uploads/1/3/5/2/135296469/4665586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_601495b77cd4b.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/67034e.pdfIn PDF document text
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/2eb7bf.pdfIn PDF document text
    • https://nimapefakapag.weebly.com/uploads/1/3/5/3/135324130/sopiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_602ede8d694d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fcc8f41ba379.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/GhbieGK/lotowexolosefukobup.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/sezumona.pdfIn PDF document text
    • https://cdn.sqhk.co/wemigiwim/icfVzgf/gesudesaw.pdfIn PDF document text
    • https://xobisejuzato.weebly.com/uploads/1/3/4/6/134694252/rojubugudan-koxovewaku-moxigudij.pdfIn PDF document text
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/2af9e588d.pdfIn PDF document text
    • https://wewokidopubix.weebly.com/uploads/1/3/0/8/130873978/9727107af58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5fec9c37c14a6.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/8376674.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/84feaae97c22d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5ffa6443b26c4.pdfIn PDF document text
    • https://zumizosapozogem.weebly.com/uploads/1/3/2/6/132681504/36b38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_53039dcdeb284c2897ca2f64f53f0216.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_0208c49f97df4cbeb470ec15a7c64722.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 5244 bytes
SHA-256: b7e440f9b938099bc3a65f07e66944c115b1c72ec1673e8b41a40d9a0c9600c8
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 12996 bytes
SHA-256: 54faaa78ee28c3f02027ef503ad5682e5ba04901b61c7faabc81de8fa042a7b6

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