Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b9691f883bfecd…

MALICIOUS

PDF

68.8 KB Created: 2021-02-07 12:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3e31bfd3d3a840ab67013158ebd78921 SHA-1: bcec2143909cd2248833a0270aa30e5a149d3fbd SHA-256: b0b9691f883bfecd906ee0f23eeb793eb2ac1c2a8a0e47dbaaf625d50c598577
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF_URI heuristic points to external URLs that are likely used to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jottigo.ru/123?utm_term=mechanical+advantage+formula+pulley PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fd9711271bd5.pdfIn PDF document text
    • https://givebuzuwipagin.weebly.com/uploads/1/3/0/7/130775776/b0bfd7.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/wolaviraretijed_dokudis.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/loxefira.pdfIn PDF document text
    • https://nozonefabizeg.weebly.com/uploads/1/3/0/9/130969368/sutur-topuvimizawe.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/RgeDUig/28076129662.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/xovekolamoxe/grammar_sheets_for_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/nidijejibe.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/69097072048.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/whatsapp_status_saver_apk4fun.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/11814438573.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/2724199536.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_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 5560 bytes
SHA-256: da2aab36a70766aff5add5bfed17daa87e695e41cf4fd208236d48629a6fba27
font_01_sfnt_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 10612 bytes
SHA-256: 5859edac32fa229ea7989a747e4b5a420d4c8368cc20bb0cebd384e6ada74c67

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