Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb850c15855e810…

MALICIOUS

PDF

75.0 KB Created: 2021-05-22 14:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 020de8856fb69e09ae288284e058601f SHA-1: 45515689c92dfa619ac77f65d7eaf918f3985f3a SHA-256: 4bb850c15855e81036c785daf0f4f67aed90ba8d8b8cdd5a003439dff2c06b40
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating it hosts numerous external links to other PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://static.s123-cdn-static.com/uploads/4415951/normal_5fc9a56fb33c2.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417403/normal_6050f3f54cd66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6051109140394.pdfIn PDF document text
    • https://bamigifumu.weebly.com/uploads/1/3/4/4/134443618/979595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_5ff466edefa7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_600f8dfc9fbc5.pdfIn PDF document text
    • https://toxuweraf.weebly.com/uploads/1/3/4/1/134108638/74971e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_6035d1ff20700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5ff413d91b0b3.pdfIn PDF document text
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/b91c75ada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530990/normal_5fcd50465089a.pdfIn PDF document text
    • https://bogobesupagal.weebly.com/uploads/1/3/0/7/130775478/kolojenulojej-midepoteposo-silodumewozod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6068634e26d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_606477d3a466a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6016f4c38cab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_6018e861b4ed4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fdd3ed58fbbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=que%20es%20un%20asociado%20en%20estados%20unidosPDF link annotation
    • https://s3.amazonaws.com/seriposuj/zolibozikulupozuxur.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/63997990214.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/what_does_the_margin_of_safety_ratio_show.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/pujebujexobosula.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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 4868 bytes
SHA-256: 1f1b73395aff32bdb5e462dd2af4b58f4305779f8623b962e73d3496e4b7914f
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 11984 bytes
SHA-256: 4ed9c150d1452e9239cc25fddcfc2bcb009d96c352a8446e1e267f67d72fa7e8

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