Malicious PDF — malware analysis report

Static analysis result for SHA-256 1165388c9d1b3f8f…

MALICIOUS

PDF

85.1 KB Created: 2021-10-07 02:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 51049cc647a1abda411f3b9e7bfafaa6 SHA-1: 30595cdb015aab5e5f68351e5a40f46b8f65625e SHA-256: 1165388c9d1b3f8f99fc3348f9c75e883c4113ad87afd1ed342103700e2e6884
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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://smidgel.ru/uplcv?utm_term=short+funny+quotes+for+letter+board PDF link annotation
    • https://upaspor.com/resimler/files/vuduroxeviparimi.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/12871548623.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/ditoxekubasap.pdfIn PDF document text
    • http://allergyc.news-read.com/upload/files/palelo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/juligasuwuxusavarodifefo.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vukomavi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9a11150293d05b2bf7f14f349b668a7f/56614477405.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/50121631181.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/taxugupedubefejizemelo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/90171892056.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/79012649203.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wezobus.pdfIn PDF document text
    • http://gro-felix.si/uploads/50631951376.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/54314081030.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/zabelo.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/53242382373.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/gavisifatonupuvurepe.pdfIn PDF document text
    • https://eventaipei.com/upload/files/sukugotemarefut.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/5727943074.pdfIn PDF document text
    • http://ingore.cn/upload/files/28447508789.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/lazekimijemanaduzisiv.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/wulakekosimadenudev.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/68780166993.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/katidubimerap.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/zexuwuvunosivowarofut.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 10936 bytes
SHA-256: 04ad72f0e1ea40429cb6ccbf9621d24eaa88475a63edfd28ea2575bdbbba69cd
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 18984 bytes
SHA-256: d2af642946cf41a443324f8cd62bfa3afe347d514e3e9567f07cbc0196c520b6
font_02_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1