Malicious PDF — malware analysis report

Static analysis result for SHA-256 f566b40e219f409f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 23:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10ddd8760c7c9281aaee0b1e3833d8b8 SHA-1: 7ce67b6d8714d897328bf16dd1f97eaa8ecb264b SHA-256: f566b40e219f409ff4cd5b4925b174d8c6a46244b1ddb4b235368f4cc04a54fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a specific rule for link farms on disposable hosting and a machine learning classifier indicating maliciousness. ClamAV also detected it as a phishing trojan. The embedded URLs and the structure of the PDF suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=atv+pro+apk PDF link annotation
    • http://cyc.cz/pictures/clanky/files/dasizidaxiv.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/96274422378.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/55262224513.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/fufazaf.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nodebuzevonuviru.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/36179026162.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/53342467834.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/baledexilewazo.pdfIn PDF document text
    • http://hflchw.com/upload/file/fafatilawetuke.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/wesizovabejibovov.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614036154f5c2---27466600670.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/padawitewuvofewuwovag.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/44038160036.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/buzepefupirekaxo.pdfIn PDF document text
    • http://grabnerestriche.at/44197754301.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d4a20c49eb09fe7a29a53c0e12e3b63b/46685760913.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210919120643.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/simamu.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210907_DE17253641CEB065.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb94929fac---41607819208.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/28477108313.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/75208825335.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vuzizogire.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_off0000b935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB935 9844 bytes
SHA-256: ccb27a2ae03d6f84d04a0250b1dfcbf1ec8b44c11bc324869033144893f76b1a
font_01_sfnt_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 17468 bytes
SHA-256: 76d2fb38a2703cb003ea4dd199c3b6aee3525b0a453e7258b6dc2058260db93b