Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c70d20a8b26b21…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 18:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0599a1115eb221b63df985cb443cd0ad SHA-1: 7ee3017e9c6b3adc5d3cf7f482c3ed0ffdc31b3d SHA-256: 65c70d20a8b26b21a58590129a753b7b1b315ec2bb5134e61474afb6d749bb3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1dddbf42d---18403602728.pdf In PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/jenidaxog.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631368657.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/31175838762.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/bikixuna.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f741247585---36389633248.pdfIn PDF document text
    • http://langyupharm.com/upload/files/tofubodop.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/68250722061.pdfIn PDF document text
    • http://vitrine-prof.com/files/59569909172.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/lusewaxokusekito.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/nixorurokituwak.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/fuxez.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/kejedus.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/dovaxexukoki.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5463110492.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/59882843386.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/tewakikenimatuzuk.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/57157720713.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/15648069718.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nojazipadis.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/33337621520.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/tezigovepa.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/49353269546.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210903_5C85EB57EBB2B1EC.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/fojewepapaborerudadipulun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+sd+card+to+internal+storagePDF 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_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 17740 bytes
SHA-256: 38501a5c20ddf5ab586a1786036de79c7713c2dca5ad358302370a88f66feba7
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10728 bytes
SHA-256: 7301c5485c0431696028e1ef59db05e7b2daec96e125c443cb7ef0c762b1cf5c
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1