Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5d360a0f073e5f…

MALICIOUS

PDF

80.2 KB Created: 2021-03-21 22:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4b37d74abf1f66f724778a542cd4b3e3 SHA-1: 053a3594824e15bc5466b30659bec5dc0b466117 SHA-256: fb5d360a0f073e5fdcac37d4dc802578852f69e431577c9b73d6ac439b7470df
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be redirecting the user to a potentially malicious site, likely for phishing or malware distribution, which aligns with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://crophysi.ru/wix?keyword=tiles+apk+rascarlo In PDF document text
    • http://kikababono.mywebcommunity.org/falaxakapud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fe0469280ec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_5fe94feae2a90.pdfIn PDF document text
    • http://manthoughtswebsite.website/what_medicine_is_given_during_cardiac_arrestx50s4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461751/normal_5fe2c6c9492b0.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/alternative_methods_to_animal_toxicity_testing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366317/normal_5fe0682a70b67.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/descargar_libro_de_balance_de_materia_y_energia_antonio_valiente.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_6025a21c6ed89.pdfIn PDF document text
    • http://begemotiks.fun/8005570512kxxjf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407793/normal_5fe03ace78c2a.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/tabejej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5fe4efb616ae4.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/70f74c0f-47c2-404f-a450-21fd0237647e/82855450890.pdfIn PDF document text
    • http://ruvemad.myartsonline.com/noduxuraxijaluzupo.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/8920148704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc172bc-dd97-4388-9a98-aa8660605bcc/93248773586.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_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 4940 bytes
SHA-256: 27bb3520c5757143888be90c501514e62974615bebd5e0a7430ffa944c765439
font_01_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 11236 bytes
SHA-256: 77a1f3aeb4b4d1c6913c741bfc716d1aedba068e69a0efad50a6a5e15655b729

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