Malicious PDF — malware analysis report

Static analysis result for SHA-256 525fd11ab7d093e3…

MALICIOUS

PDF

67.5 KB Created: 2020-11-22 12:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90420afe526a818331e35f168f86395f SHA-1: 912e7e39f3434613ff4493f44bea631d2a112087 SHA-256: 525fd11ab7d093e367318b137ba9f9a0eb5662f47d2aa6931e521e797ae8cd62
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=condon+school+boston In PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/17906.pdfIn PDF document text
    • https://durapafived.weebly.com/uploads/1/3/1/4/131438767/migisuguwi.pdfIn PDF document text
    • https://xunitumewotoril.weebly.com/uploads/1/3/4/6/134612341/694478cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fa2e80d25882.pdfIn PDF document text
    • https://gosedizomomusuw.weebly.com/uploads/1/3/4/3/134313056/55cf4d65f7cd04.pdfIn PDF document text
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/sezebodibujix.pdfIn PDF document text
    • https://zafojulokigod.weebly.com/uploads/1/3/4/7/134741370/4aedc40bf21d298.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/eb5d93.pdfIn PDF document text
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/11676c.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/potofaw/26508175677.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/regeradojareku.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/django_admin_bootstrap_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/37903608581.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_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 4764 bytes
SHA-256: 6aaf22d7f43623b8f8cce3b53a51fd84226cfe54b8107dbbef71047b479ab20a
font_01_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 12248 bytes
SHA-256: f3d6eade297c4fbe9619c69bdab3c5ffb485c48df35ed94c8fd3013f8ca1b1c3

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