Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27687484d9dbb90…

MALICIOUS

PDF

72.0 KB Created: 2021-02-06 02:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 942db1252f33866a0b76c3a7d34f7e36 SHA-1: 1c21057ef051f694ec06a236b114fe261679d55a SHA-256: c27687484d9dbb9055fb87a3d6d2787a32c8fd670d5bd49f0e08f23c317670ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Phishing.Trojan. The presence of numerous external links, particularly the one pointing to 'cyberghost.store/20293999558nqqak.pdf', suggests a malicious intent to redirect users to potentially harmful content or facilitate further infection. The document body, though heavily obfuscated, contains references to 'Adult fans of one direction' and 'wkhtmltopdf', indicating a potential lure.

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://bologen.ru/123?utm_term=adult+fans+of+one+direction PDF link annotation
    • http://cyberghost.store/20293999558nqqak.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/jghan6c/one_punch_man_the_strongest_training_challenge.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/6jhwMEJ/is_apple_music_included_with_prime.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/bodilamufejolanuwuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/cSPC3gf/sijuxorilemuwitarudojari.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/barole-kiniwedi.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/zinudipir/asana_premium_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/ballet_plie_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/61532689823.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/xetusepepixotodurini.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bomuxifafobarezidifa.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/linking_words_in_english_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/98665265948.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/mawonedidebisilifelad.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_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 5004 bytes
SHA-256: 69449e4029c95168571b0debb0f78a5ca6f4a39e183362cb6ae8a621bb3fba9e
font_01_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 10680 bytes
SHA-256: 782e282759383c6f0071d2540be6741983bb88f686c77745cb6059e0e1fd9f91

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