Malicious PDF — malware analysis report

Static analysis result for SHA-256 339dfe00d2df4001…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 15:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25647dc1707cadf6954ee166ad0615b1 SHA-1: 05f3e48e58e870aa38d8357cac9d1b53a5a61ec4 SHA-256: 339dfe00d2df40017337a41c366a83cf1d5f3e1768169383522374aadd210331
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or distribution network. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install or connect with remote support software, a common tactic for social engineering attacks. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://bilmatbasim.com/userfiles/file/nofanisaxamezuzer.pdf In PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/mefegebune.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/rebolifenalirejisajata.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210907000049440575og64ga.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://khangvietdn.com/uploads/file/31731930222.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/99018870393.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/57492076970.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/zagudukazuko.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/92990311285.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/44190354207.pdfIn PDF document text
    • http://metallpress.info/files/46531011617.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/xudowadexodumad.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/42298597601.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/klmmi0q2mttg7thp4ntoppqdup/libipowev.pdfIn PDF document text
    • http://canoeing.by/pics/files/5240301731.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/57123179992.pdfIn PDF document text
    • http://jonellchem.com/upload/files/gawunujovulopawagu.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/33408393232.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/sakinofawotozikogisexo.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/zomajazufupirixuxexu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16139777010bf9---nujezutukubimomuwefigen.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/96208172083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mirroring+app+android+to+pcPDF 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_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 10336 bytes
SHA-256: 4a2ef6bc26bd3646f2ab2af5c08a07eab569b9e92e94234552cabc4dbd4ae7bd
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 17832 bytes
SHA-256: ae39175ba6b0a7a1c8cf09574b6c2622529104176a392f4084c62f991594a92e
font_02_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1