Malicious PDF — malware analysis report

Static analysis result for SHA-256 184709de8ac49005…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 07:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 937e81b57f45b6016446fa06f43d198a SHA-1: 43cc466a08133d77c4ea1e0c47c0733ee4005cf7 SHA-256: 184709de8ac4900559d80c8d2d59c416b0d6b927b77b7ce783fdce7fe344787c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, disposable hosts, suggesting a tactic to obscure the true malicious destination. While no scripts were extracted, the presence of multiple unknown URLs points to a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://babyshelter.net/assets/upload/files/wosojogugofubujigok.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0fd421a40---folufanekera.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/fosafaninomati.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lusepadopujelo.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/59509340815.pdfIn PDF document text
    • https://hoongnau.com/upload/files/rowazegesu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gedorilurofefixorivuzuf.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/sogufokixuso.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/rolerisepuxovula.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630636472.pdfIn PDF document text
    • https://o-dance.com/upload/files/72441051580.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_2CAA9E28DEF9B18C.pdfIn PDF document text
    • http://annabarons.lv/files/files/74525948109.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/94073202282.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/kapetuwojadik.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/7705000936.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/47491883536.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/varik.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/97977838378.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/5182655687.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/fanetetukagipifolitoro.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/76999757182.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/lofalarogeta.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/78001677384.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/448031075.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85330920426.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/65104039375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=3g+to+4g+converter+softwarePDF 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_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 17488 bytes
SHA-256: 0d209470b432016495b4d5cb90ffb777149297d64ff4604104d84fddecaab76c
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 10680 bytes
SHA-256: 2185ddec1e4b0e659f1c47b4235bc464d27ec3c8d562c4bd23bf20d49b9e4149
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1