Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad11c1e0523991a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 16:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b2dfb2e95aa9c574bbf9921c3226517 SHA-1: 060d77c39b6af75b0c76637d860fd74b14ce98fd SHA-256: cad11c1e0523991a24aeec8e9053314139579dcb975cb698a0f2472d0c801686
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or distribution network. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://shengyaweb.com/uploadfile/file/2021090204344629.pdf In PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/tomiseriwewubofofagiti.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/42523744222.pdfIn PDF document text
    • https://nomortiga.com/contents/files/xusosedoru.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/37334428078.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/79982804830.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8504056c---20688470116.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/falomorapufugu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/wizozezamama.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/91289643175.pdfIn PDF document text
    • https://purefeeling8.com/data/file/59531398677.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wimusawogiza.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/gagevuxegawovuru.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/68091120135.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/98230898085.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/38581137410.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/86763105735.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/29183589032.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zolinexovowemoviputusewi.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xikevikejufozi.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/wanugimugu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ce24640f---kavibapapabinixewanorojil.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/wuxiwadinuxawam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=zip+code+cauayan+isabelaPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 17728 bytes
SHA-256: fc73645a08803e32be3179b810fcf97b2d383b39597ebe233cc73de2837da5a4
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 10628 bytes
SHA-256: 2907ba0d919ca08fb88a249d6d8eb5d15ca4eb5d8317fe10eba415abaffad504
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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