Malicious PDF — malware analysis report

Static analysis result for SHA-256 47cc466870cb2036…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 10:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a865a392b30def095a3a0f73a130aa84 SHA-1: 2ac5b8e3acadf843cc0887b3578bf42ef225cb99 SHA-256: 47cc466870cb203686ffbcd5b3d151ab6d2a310930fce964483a9960b68a0002
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the presence of multiple unknown URLs suggest an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shiokuda1.com/contents/files/xefomalu.pdf In PDF document text
    • http://finalstage.biz/js/upload/files/gufudagolikizowefekodeg.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/wanakisalijujizaba.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/xumevu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/crafuk2n7f7q0m8vlvva11rtp9/kediwadivozovojarokip.pdfIn PDF document text
    • http://nensi.si/upload/file/zomogobapokuxaveku.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/38974216828.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/84205441939.pdfIn PDF document text
    • http://zenkatsu.dk/files/73863539583.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/kimola.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/14526437768.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/laraxurowowunugamuruxevir.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/6963353006135649201d3c.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/67052722164.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/55438889169.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/12553298893.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e994ad456---gidisamo.pdfIn PDF document text
    • http://voijin.com/userfiles/files/wadiwuvetedimilowur.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/42274470939.pdfIn PDF document text
    • https://heyratacademy.ir/file/metipitafelepazew.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/91016249634.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/sexub.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/basebusaxosagev.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/5758169879.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/fifesogadoridavupet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=happy+wheels+bottle+flipPDF 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_off0000ba4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4E 16592 bytes
SHA-256: 700732856c38b25595170c49dc699b1bbc6ced87cd3a3085d754a40f06b04e69
font_01_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 10584 bytes
SHA-256: fce4298f828af7e79af4026c16cf50572ee25832de04c8578030532f2e8062d3