Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f95d3dfd45d1361…

MALICIOUS

PDF

67.4 KB Created: 2020-11-25 18:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 475e8420ac9073231e56b20658b19305 SHA-1: 85e0593a2c9ae8fdf383025e20d92916b6df993d SHA-256: 4f95d3dfd45d13616e4e3ee4e00997e091bb67fab0b9f2dc70e181c0498c51da
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of embedded external PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly flagged the PDF. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=the+practice+of+statistics+answer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5f934e0093daf.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/9404644.pdfIn PDF document text
    • https://judemitipiru.weebly.com/uploads/1/3/4/3/134388438/2852379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_5fa80104be2db.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.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/nigimul/32056682479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92db3ffc-2d3c-4d26-aa25-1872ffb28de7/47372487787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a185958-3357-489a-bcb3-94b55448cc9c/xakewerefonigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dea89fd-32fe-4c9c-a260-add4fae2be84/73542676926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67271895-e965-49da-870d-8805ed2f3217/coordinating_conjunction_exercises_with_answers.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_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 5112 bytes
SHA-256: d88c3e528017e0bb85aa488e201b702cd84d18872a5b7e41c667b1aa29237752
font_01_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10216 bytes
SHA-256: 55c817c6a7fe59298b9ef9787497d3cd606ad7f24289372dde05dc3076c58cd0

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