Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9ea5c1e3f1c34…

MALICIOUS

PDF

68.6 KB Created: 2021-09-21 00:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 494c71add8df5855382619f3ecdeeadc SHA-1: 77726b41620c4e3867110df25fbb6f93d83a26bf SHA-256: 79c9ea5c1e3f1c34db582a723dc4a78ba1df89e113c3fe5dde9cc01b8dd4853c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware delivery. It contains numerous embedded URLs pointing to potentially malicious or disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pixomot.ru/uplcv?utm_term=how+to+convert+video+file+to+mp3 PDF link annotation
    • http://unitez.net/images/newtech/files/munebeduwolenorexo.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/57878379147.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/8875074756.pdfIn PDF document text
    • http://yongqingtech.com/d/files/13965197372.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/84773733051.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/dafasoxagixawenalelonag.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210917204814.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/41358911191.pdfIn PDF document text
    • http://land89.com/ckupload/files/73806428590.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/29042164083.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/jetuluzulanu.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/11/jutexawarosenaz.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/nogaxesuvobeduxose.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mipiweja.pdfIn PDF document text
    • http://millecolori.it/images/file/47980036641.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gelutuwitisunuvibazufo.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/64604207269.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/tavufudogivofipizawepesax.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7e6703a3---40708718764.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/6a5f03276da6edd634bede788662cc46/fumudetezidel.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/10889629582.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/50375958148.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 14060 bytes
SHA-256: 405ec22661810796e1da82d99959b57d89c87d41e64974b533116250ff967680
font_02_sfnt_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 10768 bytes
SHA-256: 9d35f477f091dbfc6379ed37c09ba5dba8ab21a336836b587b3498ec9ce2b50d

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