Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f5e033a3e94b3a…

MALICIOUS

PDF

68.5 KB Created: 2021-01-23 15:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2c4100b95d847661d3164b71b2611698 SHA-1: 3360ebc3bf333879662912c939dfc13a482528b7 SHA-256: 51f5e033a3e94b3aea858342f6e818b641d2cbaaa2334b701f7df364be891ff2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URLs, with one specifically referencing 'minecraft trapped chest secret door', suggesting a lure to trick users into clicking on potentially harmful links. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support the conclusion that this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffking.ru/123?utm_term=minecraft+trapped+chest+secret+door PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443325/normal_5fd28946b4559.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/duwuviwepuwitikig.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/rgcifjf/sivujima.pdfIn PDF document text
    • https://site-1179506.mozfiles.com/files/1179506/employment_application_form_template_singapore.pdfIn PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/ladokamuxuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_5fe8d4cba8e1e.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/b271453dfc80f.pdfIn PDF document text
    • http://rabejagoruwobol.66ghz.com/35604475510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelidug.epizy.com/pelowaj.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/bmtc_bus_pass_form_for_engineering_students.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/zen_alarm_clock_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/66631094946.pdfIn PDF document text
    • http://folizel.epizy.com/dusirevaf.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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 5216 bytes
SHA-256: 42c6943482646df9c38709449c67b3d929a31ba228473eab549f178c2baf0ff1
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10616 bytes
SHA-256: 9b04def97a499ec35e966f871d91eb12cb84d67fb05a5901f0d9960acd8124f9

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