Malicious PDF — malware analysis report

Static analysis result for SHA-256 04146b13eb515165…

MALICIOUS

PDF

89.0 KB Created: 2021-09-19 14:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96485fa6258f3057c466e9773b6387e5 SHA-1: f161d3e1b9e99fa79c4a4ea9562c33360e639a63 SHA-256: 04146b13eb5151658769ba86f4ae0579df707e9feb8f9440a26d58c99ecdabd4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics suggest the PDF acts as a link farm, directing users to various unknown PDF files hosted on potentially disposable domains, likely for phishing or malware distribution. The presence of urgency lures and download button text further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://toyotarent.tw/FileData/ckfinder/files/20210919_1052848E8F314E01.pdf In PDF document text
    • https://incense888.com/uploads/files/202109051313266144.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/malogoj.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/xoxuvebefonu.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/lugekaman.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/71329864499.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/13081926257.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/zevezususinepi.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/99431391424.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/90076060013.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/16932817099.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/67459203663.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/wizuponulokifibevepiwu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb3672f82---88140883849.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/gokuseruxejigisuvifatuz.pdfIn PDF document text
    • http://vaynhe.com/upload/files/44677548937.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/20271478716.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/zofusapimimarajinelibubu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/xiwelutimibuj.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lujebufosofep.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/91504554860.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/lozitumino.pdfIn PDF document text
    • https://123natura.com/stockages/files/dotaf.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/92056200675.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/72338122932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=real+gangster+vegas+crime+gamePDF 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_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 19328 bytes
SHA-256: 33b72e2fdd55c2cb3707bce0e1a236b3d23a3db5db919f566c07f743e2560d30
font_01_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8A 10564 bytes
SHA-256: d690bbdd8f0d783b3118473fc36136c5eadb98a5a4587c8e12890b14f0809708