Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de9398b1ea2ea3c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 04:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bd03dd66fbcbfbd282cb9c62d300ff1a SHA-1: dd54bd809037b77634cec1b90f8840c1db4013aa SHA-256: 1de9398b1ea2ea3cba56b7cc4d7becdf8f27bb8fbd9ce14cddb85b32d122ed05
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, pointing to a suspicious PDF URL. The presence of numerous embedded URLs, many leading to unknown domains, further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://fszhenjia.com/upfolder/e/files/20210903023508.pdf In PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/bimefitozelajirigudu.pdfIn PDF document text
    • https://norservis.info/files/files/10182089586.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/fegejufonavesoruget.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/wumowamesabumof.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/xuxabusejuxopem.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/85815814a85b33b896b2ca15b0881b53/madidabilod.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/32021651359.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/doderulevaj.pdfIn PDF document text
    • http://sinostandards.net/upload/files/ratipimuj.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021991125541622.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/rawot.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/wowagibuwamaruri.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/jezudixilarugoral.pdfIn PDF document text
    • http://northcity.rs/slike/files/kufisa.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/27671898153.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/70500891706.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gaxijomoxadigegabijote.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/82540464742.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/nepatirefexabilozu.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/46090741283.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/52959628108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+and+iphone+market+sharePDF 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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 10684 bytes
SHA-256: bfe2be17f55c5ea538ee1a6dfd59fcd149a50f84aca84bd845fc46ada698b1ff
font_02_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 17792 bytes
SHA-256: a7774702b87b154bc9f47f0320cff0030de100cdf370214aa90915c73b5ff439

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