Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7816f7899bf8aa…

MALICIOUS

PDF

59.9 KB Created: 2020-11-18 15:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cd1620bed4fe9183817a2d913efa4452 SHA-1: b2cd81ebab1823cd0d0df556c896a79d5e464f8f SHA-256: 3e7816f7899bf8aa4c6ba8296abe84f3fce9510c947725c1c381775cefb3c164
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one identified as a malicious redirector. The heuristic firings indicate a link farm designed to direct users to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffking.ru/123?utm_term=physical+science+1st+semester+exam+study+guide+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f870f0e9531e.pdfIn PDF document text
    • https://zubajabazu.weebly.com/uploads/1/3/4/4/134466761/3651787.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/tadositivaw-sazas-bixilarab-nadolususupi.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/wejelumugiwe-wunol-modesixesimobu-dixagazenaraz.pdfIn PDF document text
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/vuwaxijaran-fakidesitaj-xeresubunera-nawasutif.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/bumelokatenexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fa119aada9be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f887cce1c711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa46eebc-42f8-42a8-b85f-867ad55432e7/everfi_module_1_savings_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930995f9-5417-46c5-9dca-b54511c6d495/setokedosutopasunasi.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_off0000aa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8E 5668 bytes
SHA-256: 0c9d927ac336f019d50fe7cc6c3ebe4f1610c7846ac5dbbe9c2ce38e4855f7cd
font_01_sfnt_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 10620 bytes
SHA-256: 7ba555ae0757d27ef2095e485842f95d8373b6b1abfb417b7f983d1235784c81

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