Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0d09307abf1811…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 16:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5170fb04c13875ee24c8e627cca7857b SHA-1: a6089c307b3120cb8bd0c4cd079f8fd49227273c SHA-256: 1b0d09307abf1811d5f695d413437f887c9719e6d2ea2637dc44a0ee94eb80fd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being part of a link farm designed to host malicious content or redirect users. No scripts were extracted, but the structure suggests it's designed to lead users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 4

  • 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://solucionaesp.com/ckfinder/userfiles/files/74336081361.pdf In PDF document text
    • https://datawire.gr/files/files/52984875606.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/81435245906.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/dugafilufisufetuzax.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/fizoxu.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090609131073499.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/gunivadozaza.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/54152130154.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/9387341652.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/17417001415.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/fiwavoka.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/87433668801.pdfIn PDF document text
    • http://trieuduong.com/images/Download/36528822741.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902145254.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/wiwevog.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/44131668265.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/mokeluneguf.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/ximab.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/wirexuxodoned.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/jukorevetaradar.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pofumumuxibo.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/8462214647.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/6861969529.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/rapitekapiwepexas.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/dujoxegetoripavoxex.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/batenewuwunevixopoboxu.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kivipifazezidilofotokopeg.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bokoligodogil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mac+not+detecting+android+phonePDF 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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10572 bytes
SHA-256: f887c51530dceac51c2b52aa23639d360b3cf0f977cb256f988f9205983a90a3
font_02_sfnt_off000115c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 18284 bytes
SHA-256: 33cde9b80ce417d90e1686743ae68b103f713b1bd17f4fc99b2abb92b1a0ab28