Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd631a70bbeea1a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 04:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d08b77aa175c3ad6afa337b77f6ad71e SHA-1: d3b8fe43db568a61b66463c988a8a390364cc383 SHA-256: fdd631a70bbeea1a8478bd15719c35c57b1cbd4d78aa368d6c79a2c6e42ff3bf
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. Notably, it includes a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. The embedded URLs likely lead to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://xezojetit.ru/wix?keyword=cool+math+games+snake PDF link annotation
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/277127985a.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/77223f101e.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/3b3e61f.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/vuxenusopumijobi.pdfIn PDF document text
    • http://ketabizuf.22web.org/linula.pdfIn PDF document text
    • https://xawonetata.weebly.com/uploads/1/3/4/3/134363244/natemuvav_dowamabakowen.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/246008e2cbdeab4.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/wutuvineri.pdfIn PDF document text
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/e9c9c4239.pdfIn PDF document text
    • http://sudebatuwilazet.iblogger.org/45355980658.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/madilugewu-xezezufemamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_60207425d8006.pdfIn PDF document text
    • https://mamiwego.weebly.com/uploads/1/3/4/3/134315995/lozenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_6029505bed40c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dozuxix.myartsonline.com/zoom_h4n_pro_mic_stand_adapter.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/26023222825.pdfIn PDF document text
    • http://rapaxaj.rf.gd/24184047963.pdfIn PDF document text
    • http://wepiliga.epizy.com/cisco_umbrella_deployment_guide.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/nemitigakuwam.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/genetics_and_genomics_in_medicine.pdfIn PDF document text
    • http://fixadamobus.epizy.com/zilabolad.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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 4972 bytes
SHA-256: 466382e7a0adf906e380dc030c24e7da365163bbd3de3fdb3f46afb61b397168
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 11152 bytes
SHA-256: 09d547c2363c6adc823a3cb9f297dea35fc9ebfb4b55b323f5d94c358f925f4b

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