Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d992d3d28819f7…

MALICIOUS

PDF

68.9 KB Created: 2021-01-15 16:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef7263402b4362ca86372663160758e7 SHA-1: dd65d636e01382a912b4a49af8400eac9d99c399 SHA-256: 97d992d3d28819f74204d18f66de88e1ff8f7998c09b46c62f200cef185cc8c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a questionnaire lure. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=tb+questionnaire+texas+health+steps PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fc96582b9796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_5fb2bd27a42d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5fc89109d3b21.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/00ebed77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5fd8daf9cc72c.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/sezebepit/7283661163.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/gonevejesozepesoroput.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/57538176952.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/2137906261.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/sukukid.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/51922868493.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/li_ning_badminton_racket_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/81527420821.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/604362455.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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 5188 bytes
SHA-256: 1a6665571c729041a18a6491439400c40224321373c4b42fff6017a06dc8b6c8
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 10524 bytes
SHA-256: 5b9a7ed70b14ed66bf87758e83876ea2b5eac3e7b848bfab80c2e1a4b8418411

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