Malicious PDF — malware analysis report

Static analysis result for SHA-256 9effb7f7cf796cb4…

MALICIOUS

PDF

68.7 KB Created: 2021-02-20 22:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5f4d6a5cb50c454572eedfee52236a8b SHA-1: dd6dbf020cc0d880466efe09a901a4282925edb4 SHA-256: 9effb7f7cf796cb4fde4c16c1e0c8f80a2c7fff897ed77c1e47ea05a2f82d250
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though heavily obfuscated, contains references to 'Logitech unifying receiver pairing tool' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=logitech+unifying+receiver+pairing+tool PDF link annotation
    • http://fusojosejivo.iblogger.org/centre_stage_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60145f33be500.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/ac109.pdfIn PDF document text
    • https://kiwepuzimogavuf.weebly.com/uploads/1/3/0/7/130776877/zasadipetagorudag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5ff1df9e833d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fc9bbde404ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiburomuwilun.epizy.com/vemutij.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/36760900487.pdfIn PDF document text
    • http://pesipobigon.rf.gd/govenaxuritoralup.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/tamilrockers_2018_movies_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/dolutunakoj.pdfIn PDF document text
    • http://wozawexopad.epizy.com/xugofisebetugetebojos.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/73466980178.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/9025555155.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/vutizeveme.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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 5204 bytes
SHA-256: 4f53725b556069a9e59bc024c9d59779773f037869936802011537a4db39a058
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10776 bytes
SHA-256: f3567fc57e44c6061ef93ba9319afc8fac0d27ae7785c972128eb506934e94a8

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