Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6166e176e1e5607…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 22:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69018aaa0963a340d975565806d9e86a SHA-1: dd6ff8f09078ab6c346ecd742bfa249e3eafba18 SHA-256: b6166e176e1e56079fcc67ecdc22044ec187cfc65084e692fcf1c7a5d0127564
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://brilliantsolarpaneling.com/userfiles/file/zitijapijonipexupo.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/bogamomojefupijuru.pdfIn PDF document text
    • http://normel.org/files/upload/file/jaratafanamepisa.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/rafaxalera.pdfIn PDF document text
    • http://checopharma.com/upload/files/penavuva.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xupibus.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wizesunalakenobapofa.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc7a182c4---29853707151.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/67058207308.pdfIn PDF document text
    • http://riviera.az/userfiles/file/najidoxadekumirakogelezos.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/lu44a28n0h1srpcf31g3usnoal/fozivivej.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/1305640201.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/kejekafejidawebevijan.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/vesexevasamuwatoduzi.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/39753045510.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/vudodofegunikokopub.pdfIn PDF document text
    • http://kes.org/upload/editor/files/12107663580.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/39869702848.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/xebulokuleg.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/49062676454.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909123718.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/52851128566.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/68695043352.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/9169946598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+x+max+price+in+bdPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10660 bytes
SHA-256: 1903395974ac5aeee4e7bcd3a5b959a8346414b576b24dcd8cfc01cfcc36c933
font_02_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 18488 bytes
SHA-256: 7a301f8df87f0f7f707cad713dea30cc09690176caab96a5535ae69d8b9689c5

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